Legal Terms — U

A rule structure stating a general prohibition or requirement followed by an exception introduced by unless that identifies the limited circumstances under which the prohibition or requirement does not apply.

A uniform statute adopted in nearly every state that governs commercial transactions. It supplies default rules for the sale of goods, negotiable instruments, secured transactions, and related subjects when parties leave terms open or when disputes arise over formation, performance, or remedies.

A statutory rule under which any affirmation of fact or promise relating to goods that becomes part of the basis of the bargain creates an express warranty that the goods shall conform to the affirmation or promise. A description of the goods or a sample or model that becomes part of the basis of the bargain likewise creates an express warranty of conformity. No formal words such as warrant or guarantee and no specific intention to create a warranty are required.

A statutory rule permitting sellers to exclude all implied warranties in sales of goods by using expressions such as as is or with all faults. The language must call the buyer's attention to the exclusion and make plain that no implied warranty exists unless the circumstances indicate otherwise.

A statutory framework that governs the creation, attachment, perfection, priority, and enforcement of security interests in personal property and fixtures. The framework applies to transactions that create security interests by contract and to certain sales of accounts and consignments. It excludes landlord liens, wage assignments, and other enumerated interests.

A statutory rule requiring tender and acceptance of a commercially reasonable substitute when the agreed manner of delivery or payment becomes commercially impracticable without fault of either party.

A statutory rule providing that, to exclude or modify the implied warranty of merchantability or any part of it, the language must mention merchantability and, if in a writing, must be conspicuous.

An international treaty that supplies uniform rules for contracts for the sale of goods between parties whose places of business are in different contracting states. The convention addresses formation of the contract and the rights and obligations of the seller and buyer but excludes questions of property rights in the goods sold.

A federal prosecutor appointed by the President with Senate confirmation to represent the United States in criminal prosecutions and civil litigation within a specific judicial district. The office carries a four-year term and remains subject to presidential removal. Authority includes conducting grand jury proceedings and approving procedural steps such as case transfers under the Federal Rules of Criminal Procedure.

An official compilation of the general and permanent laws of the United States organized by subject matter into titles and sections.

The organic document that serves as the supreme law of the United States. It establishes the structure of the federal government by vesting legislative power in Congress, executive power in the President, and judicial power in the federal courts while imposing limits on governmental authority through enumerated rights and structural safeguards.

A federal judicial officer appointed to assist United States district judges by conducting preliminary criminal proceedings, managing civil pretrial matters, and performing other duties delegated by statute or local rule.

A category of persons who hold elected or appointed positions or employment within the legislative, executive, or judicial branches of the federal government or of a state, city, municipal, or local government. The category reaches employees of government departments and agencies as well as employees of state universities and public pension funds.

The official codification of the general and permanent laws of the United States enacted by Congress.

A uniform act regulating consumer credit transactions by imposing disclosure requirements, rate ceilings, and remedies for violations.

A uniform statute supplying jurisdictional standards for adoption proceedings. States that adopt it use its residency and filing rules to determine which court may hear an adoption petition.

A claim to a title better than that held by another party in possession of land. The claim distinguishes a holdover tenant who remains without legal right from one who asserts an independent basis for continued possession.

An adverb used in Latin legal maxims to identify the location where a right or duty arises.

A citation shorthand used in legal writing to refer the reader to a source or passage previously identified earlier in the same document.

A uniform statute governing commercial transactions that has been enacted with variations in every state. It supplies rules for sales of goods, negotiable instruments, secured transactions, and related matters.

A statutory rule in Article 2 of the Uniform Commercial Code that permits parties to a sales contract to provide for remedies in addition to or in substitution for those otherwise available under the Code. The rule allows the parties to limit the buyer's remedies to repair or replacement of nonconforming goods. When an exclusive or limited remedy fails of its essential purpose, the buyer may resort to any remedy available under the Code, and limitations on consequential damages remain enforceable in commercial transactions unless unconscionable.

A statutory definition that establishes when a promise or order qualifies as a negotiable instrument. The provision requires an unconditional promise or order to pay a fixed amount of money that is payable to bearer or to order at the time it is issued or first comes into possession of a holder, payable on demand or at a definite time, and free of other undertakings by the maker or drawer.

A statutory framework within the Uniform Commercial Code that governs letters of credit. It establishes rules for issuance, performance by issuers, and remedies when performance fails.

A statutory framework governing the attachment, perfection, priority, and enforcement of security interests in personal property and fixtures as well as certain sales of receivables.

A document that a secured party files in a designated public office to perfect a security interest in personal property. Filing establishes the secured party's priority against third parties claiming an interest in the same collateral.

A document filed under Article 9 of the Uniform Commercial Code to provide public notice of a security interest in personal property or fixtures. Filing perfects the interest against third parties and establishes priority. The filing is unnecessary or ineffective for property subject to certificate-of-title statutes or certain federal laws.

A statutory definition of good faith requiring honesty in fact and the observance of reasonable commercial standards of fair dealing.

A statutory obligation requiring parties to contracts governed by the Uniform Commercial Code to perform and enforce their agreements in good faith. The obligation supplies a standard for evaluating conduct but does not by itself create an independent cause of action.

A statutory rule under which course of performance accepted or acquiesced in without objection receives great weight in interpreting an agreement. Manifestations of intention are construed as consistent with any relevant course of performance, course of dealing, or usage of trade whenever reasonable. Express terms control over course of performance, which in turn controls over course of dealing and usage of trade, when consistency is unreasonable.

A statutory rule rendering a contract for the sale of goods priced at five hundred dollars or more unenforceable unless a record indicates that a contract for sale has been made between the parties and is signed by the party against whom enforcement is sought or by the party's authorized agent or broker. A record is not insufficient because it omits or incorrectly states a term agreed upon, but the contract is not enforceable beyond the quantity of goods shown in the record.

A statutory provision governing additional or different terms in an acceptance or written confirmation for the sale of goods. It permits contract formation despite variance from the offer unless the acceptance is expressly conditional on assent to the new terms. Between merchants additional terms may enter the contract unless they materially alter it or meet other statutory bars.

A statutory rule permitting a party to a contract for the sale of goods to delegate performance of its duties to another unless the parties have agreed otherwise or the other party has a substantial interest in having the original promisor perform or control the required acts. Delegation of performance does not relieve the delegating party of any duty to perform or of liability for breach.

A statutory rule creating express warranties when a seller makes an affirmation of fact or promise relating to goods that becomes part of the basis of the bargain. The rule also creates warranties from any description of the goods or any sample or model that becomes part of the basis of the bargain. Goods must then conform to the affirmation, promise, description, sample, or model.

A statutory rule permitting a seller to exclude all implied warranties by using expressions such as as is or with all faults that in common understanding call the buyer's attention to the exclusion and make plain that no implied warranty exists unless the circumstances indicate otherwise.

A provision in Article 2 of the Uniform Commercial Code that permits a seller to cure a nonconforming tender of goods if the time for performance has not expired or, under stated conditions, even after expiration.

A statutory rule in Article 2 of the Uniform Commercial Code that prescribes the manner and effect of a buyer's rejection of goods. Rejection must occur within a reasonable time after delivery or tender and requires seasonable notice to the seller. After a rightful rejection the buyer must hold the goods with reasonable care for a sufficient time to permit removal but incurs no further contractual obligations regarding the goods.

A statutory rule permitting a buyer who has accepted goods to revoke acceptance when a nonconformity substantially impairs their value to the buyer. Revocation is available if acceptance rested on the reasonable assumption that the nonconformity would be cured and cure did not occur seasonably or if acceptance occurred without discovery of the nonconformity because of difficulty of discovery or seller assurances. The revocation must take place within a reasonable time after discovery of the ground, before any substantial change in the goods not caused by their own defects, and must be communicated by notice to the seller.

A statutory rule in contracts for the sale of goods that imposes on each party an obligation that the other's expectation of receiving due performance will not be impaired. When reasonable grounds for insecurity arise with respect to the performance of either party, the other may in writing demand adequate assurance of due performance and until receipt of such assurance may, if commercially reasonable, suspend any performance for which it has not already received the agreed return. Acceptance of any improper delivery or payment does not prejudice the aggrieved party's right to demand adequate assurance of future performance.

A statutory rule excusing a seller from delay or nondelivery of goods when performance has been made impracticable by the occurrence of a contingency the nonoccurrence of which was a basic assumption of the contract. The seller must have taken all reasonable steps to assure performance and must notify the buyer seasonably of any allocation or nondelivery.

An action available to a seller of goods that permits recovery of the contract price when the buyer fails to pay as due. The remedy applies to goods accepted by the buyer or to conforming goods lost or damaged after risk of loss has passed. It also reaches goods identified to the contract when the seller cannot resell them at a reasonable price after reasonable effort or when circumstances indicate that effort would be unavailing. The seller must hold identified goods for the buyer while the action proceeds.

A statutory rule authorizing a buyer in a contract for the sale of goods to recover incidental damages incurred in connection with a seller's breach and consequential damages resulting from the buyer's particular requirements of which the seller had reason to know at the time of contracting, provided the losses could not reasonably be prevented by cover or otherwise.

A statutory rule governing contracts for the sale of goods that permits parties to liquidate damages in their agreement only at an amount reasonable in light of the anticipated or actual harm caused by the breach, the difficulties of proof of loss, and the inconvenience or nonfeasibility of otherwise obtaining an adequate remedy. A term fixing unreasonably large liquidated damages is void as a penalty.

A statutory implied warranty that goods sold by a merchant with respect to goods of that kind are merchantable. Goods satisfy the warranty when they pass without objection in the trade under the contract description, are fit for the ordinary purposes for which such goods are used, and meet the remaining standards listed in the statute.

A statutory rule that implies a warranty of merchantability in a contract for the sale of goods if the seller is a merchant with respect to goods of that kind. The warranty requires that the goods pass without objection in the trade under the contract description, be fit for the ordinary purposes for which such goods are used, and meet the other standards listed in subsection (2).

A statutory rule that governs the rights of an assignee of an account or payment intangible against the account debtor. The rule requires a signed notification of the assignment before the account debtor must pay the assignee directly. It permits discharge of the obligation by payment to the assignor until such notification is received.

A statutory rule governing delegation of performance and assignment of rights in contracts for the sale of goods. A party may delegate performance unless the parties agree otherwise or the obligee has a substantial interest in having the original promisor perform or control the acts. An assignment of the contract or all rights under it also delegates the assignor's duties unless the language or circumstances indicate otherwise. Neither delegation nor an assumption agreement discharges the delegating party's duties or liabilities unless the obligee agrees.

A statutory rule permitting a party to a contract for the sale of goods who has reasonable grounds for insecurity about the other party's performance to demand in writing adequate assurance of due performance. Until receipt of that assurance the insecure party may if commercially reasonable suspend any performance for which the agreed return has not been received. Failure to provide adequate assurance within a reasonable time constitutes a repudiation of the contract.

A standard financing statement form filed to perfect a security interest in personal property under Article 9 of the Uniform Commercial Code. The filing provides public notice of the secured party's interest in the collateral and establishes priority against third parties such as lien creditors and subsequent purchasers.

A document filed under Article 9 of the Uniform Commercial Code to perfect a security interest in personal property or to give notice of an agricultural lien.

A uniform statute that sets jurisdictional standards for child custody proceedings. The act assigns primary jurisdiction to the child's home state and limits modification of prior decrees to cases showing changed circumstances affecting the child's best interests.

A uniform statute that establishes jurisdictional standards for initial child custody determinations and for enforcement and modification of custody orders across state lines. The statute prioritizes home state jurisdiction and provides rules for continuing exclusive jurisdiction in the state that rendered the initial decree.

A uniform act adopted by all states that establishes procedures for establishing, enforcing, and modifying child-support and spousal-support orders across state lines while ensuring a single controlling order.

A principle that a particular action or remedy is available only after all other alternatives have been exhausted.

A conclusion of fact logically deduced from evidentiary facts. The conclusion supplies the decisive factual predicate for applying a legal rule or standard to the parties' dispute.

Facts essential to establishing the elements of a claim or defense and that directly determine the outcome of a legal dispute. These facts stand in contrast to evidentiary or mediate facts that merely supply support for reaching the ultimate determination.

An issue of fact or law that the trier of fact must decide to resolve the case. In evidence law an opinion is not automatically inadmissible merely because it addresses that issue.

A fact or conclusion that directly resolves a claim or defense without any intervening inferences. An opinion embracing such a fact or conclusion is admissible if it otherwise satisfies the requirements for lay or expert testimony.

A central factual or legal issue that the trier of fact must resolve to decide the case.

An issue of fact necessarily resolved by a valid and final criminal judgment. When a jury acquits a defendant after deciding such an issue in the defendant's favor, the Double Jeopardy Clause bars the state from relitigating the same factual question in a later prosecution even if the charges involve different victims or statutory counts.

A constitutional principle that categorically bars imposition of the death penalty on intellectually disabled offenders and for non-homicide child rape. The principle rests on the Eighth Amendment prohibition against cruel and unusual punishment and renders such defendants and offenses ineligible for capital punishment regardless of aggravating facts.

Judicial examination of whether a governmental or organizational action falls outside the legal authority granted to the actor. The inquiry focuses on the scope of delegated power rather than the wisdom or policy merits of the decision. When the action exceeds that scope the reviewing court may invalidate it.

An activity that creates a high degree of risk of serious harm that cannot be eliminated by the exercise of reasonable care. Courts consider factors such as the likelihood and magnitude of harm, the inability to eliminate risk through care, and the appropriateness of the activity to its location when classifying conduct as ultra-hazardous.

An activity so inherently dangerous that one who carries it on is subject to strict liability for resulting harm even if the utmost care is exercised. The doctrine places the loss on the actor who chooses to engage in the activity rather than on innocent victims. Contributory negligence does not bar recovery unless the plaintiff voluntarily and unreasonably assumes the risk.

Conduct that creates a high degree of risk of serious harm to persons or property. The risk cannot be eliminated by the exercise of reasonable care and the activity is not a matter of common usage in the community.

An activity that carries a high degree of risk of serious harm to persons or property. The risk cannot be eliminated by the exercise of reasonable care. The activity is not a matter of common usage in the community.

A protective order issued in civil discovery that permits a producing party to designate materials as confidential. The order then prohibits the receiving party from disclosing those materials to third parties outside the litigation.

An impartial person appointed to make an award or a final decision, usually when a matter has been submitted to arbitrators who have failed to agree. An arbitral submission may provide for the appointment of an umpire.

A prefix attached to a root word to express negation or opposition.

An expression denoting unanimous agreement or action without dissent. The phrase requires every participant to concur on the outcome or decision at issue.

Language or conduct that admits of only one reasonable meaning or interpretation. Courts treat such language or conduct as conclusive without resort to extrinsic evidence to discern intent.

A state of complete accord reached only when every participant consents without dissent.

A method by which directors or shareholders approve corporate action without holding a meeting when every person entitled to participate signs a written document setting forth the action.

An act or thing done without authority. A signature or indorsement is unauthorized when made without actual, implied, or apparent authority.

Access by a third party to information relating to the representation of a client that occurs without the client's consent or other legal authorization. The term identifies the risk that lawyers must address through reasonable preventive measures when selecting and using technology or storage methods for client files.

A personal defense to enforcement of a negotiable instrument arising from the addition of words or numbers to an incomplete instrument without authority or beyond the authority granted. The defense prevents a holder who is not a holder in due course from enforcing the instrument according to its completed terms.

Conduct by which a person not admitted to the bar provides legal services or advice to others. The prohibition bars nonlawyers from preparing legal documents, counseling clients on remedies or procedures, or giving instructions on evidence and filings, even when the provider makes no claim to bar membership.

Conduct by a nonlawyer that constitutes the practice of law in a jurisdiction where the person is not licensed or admitted. Such conduct includes preparing legal documents, giving advice on legal remedies or procedures, and instructing clients on evidence or filing requirements. Nonlawyers may only perform mechanical tasks such as typing forms already completed by clients without guidance.

A signature made without actual, implied, or apparent authority. The term includes a forgery.

Use of property, materials, identity, or information without permission from the owner or legal authority.

The condition of a declarant being unable to testify at a hearing or trial. This status triggers hearsay exceptions under Rule 804 when the declarant is exempted by privilege, refuses to testify despite a court order, testifies to a lack of memory, is unable to attend due to death or illness, or is absent despite reasonable efforts to procure attendance or testimony.

A status of a declarant that satisfies one of the enumerated grounds permitting certain hearsay exceptions. The status arises when the declarant is exempted by privilege, refuses to testify despite a court order, testifies to a lack of memory, cannot attend because of death or infirmity, or is absent despite reasonable efforts to secure attendance or testimony. The status does not exist if the statement's proponent procured or wrongfully caused the declarant's absence to prevent testimony.

A status of a declarant who cannot or will not provide testimony at trial. The status exists when the declarant is exempted by privilege, refuses to testify despite a court order, testifies to lacking memory of the subject matter, is unable to attend because of death or infirmity, or is absent and the proponent has been unable by reasonable means to procure attendance or testimony.

A condition or risk that cannot be eliminated even when reasonable precautions or care are exercised. The concept identifies harm or danger that persists despite diligent efforts to avoid it.

Prior acts of misconduct by a defendant that were never charged as crimes in the pending case. Such evidence may be offered under Federal Rule of Evidence 404(b) for a non-propensity purpose such as motive, intent, identity, or absence of mistake when there is sufficient evidence for a reasonable jury to find that the defendant committed the prior act and the probative value on the permitted issue is not substantially outweighed by the danger of unfair prejudice.

A promise to pay a fixed amount of money that contains no conditions or qualifications on the duty to pay. The promise must stand on its own terms without reference to external events or performances that could defeat the obligation.

A doctrine that permits a court to decline enforcement of a contract or contractual term that is unfair or oppressive at the time of formation. The doctrine focuses on procedural defects in bargaining or substantive imbalance in the terms exchanged. A court may refuse enforcement entirely, sever the offending term, or limit its application to avoid an unfair result.

A doctrine permitting a court to refuse enforcement of a contract or term that is unconscionable when made. The doctrine authorizes the court to decline enforcement of the entire agreement, to enforce the remainder after excising the offending term, or to limit the term's application to prevent an unconscionable result. Determination of unconscionability examines the setting, purpose, and effect of the agreement, including defects in the bargaining process and gross disparity in the exchange.

A judicial standard under which a court may refuse to enforce a contract or term that is grossly unfair at the time of formation. The standard examines both procedural defects in the bargaining process and substantive imbalance in the exchange. Courts apply it to prevent oppressive results while preserving the remainder of an agreement when possible.

Conduct that renders a contract or term unenforceable because it produces oppression or unfair surprise at the time of formation. Courts examine the setting, purpose, and effect of the bargain, including defects in the bargaining process and gross disparity in the exchange.

A contract or clause so unfair or one-sided at the time of formation that enforcement would shock the conscience. A court may refuse to enforce the entire agreement, excise the offending clause, or limit its application to prevent an unconscionable result. The determination rests on the commercial setting, purpose, and effect of the term together with any procedural defects in the bargaining process.

Conduct by a tenant under a percentage lease that unfairly shifts business away from the leased premises to other locations. Courts penalize the conduct as a breach of the implied covenant of fair dealing.

A physiological state in which a person lacks awareness and voluntary control over bodily movements. Bodily movements occurring during this state do not qualify as voluntary acts that can support criminal liability. The same state prevents effective consent to medical treatment or sexual contact.

A statute, governmental conduct, court decision, or private contract that violates one or more provisions of the U.S. Constitution or a state constitution.

A constitutional defect in a penal statute or ordinance that renders it invalid under the Due Process Clause because it fails to provide fair notice of prohibited conduct or invites arbitrary and discriminatory enforcement by officials.

A fact, issue, or matter that the parties do not dispute. The absence of disagreement allows courts and lawyers to treat the point as established without further proof or argument.

A volitional defect arising from mental illness that renders a defendant unable to control his actions or conform his conduct to the law even when he understands the wrongfulness of the act. The defect may develop gradually or exist over an extended period rather than arising in a sudden outburst.

A defendant or litigant appearing without the assistance of an attorney in a legal proceeding.

A form of attestation by which a person affirms that statements in a writing or testimony are true. Falsehoods in such a declaration expose the declarant to criminal liability for perjury. The phrase substitutes for a formal oath in many statutory and procedural contexts.

Conduct by a private party that is fairly attributable to the state. Attribution occurs when the party performs a traditional public function with significant state participation or when the state compels, encourages, or creates a symbiotic relationship with the private conduct.

A state of impairment in which a person is deprived of clearness of mind and self-control because of alcohol, narcotics, or other drugs. The condition affects capacity to consent, to contract, or to form the mental state required for certain offenses.

A financial condition of a corporation or other business entity in which equity capital is inadequate relative to the foreseeable risks and capital needs of its operations.

A foundational obligation, fact, or predicate that supports or is secured by a legal device, opinion, or liability determination. The validity or scope of the supporting structure depends on the existence and character of this base element.

A primary debt or promise to pay that a security interest or secondary obligation secures. The existence and validity of this obligation determine whether the security device remains enforceable. If the obligation is void or discharged, the security interest may be extinguished.

A promise, pledge, or commitment to perform a specified act or render services.

A lawyer's assumption of responsibility for a client's legal matter. The assumption occurs when the lawyer agrees to provide legal services or begins performing work on the client's behalf. It triggers duties of competence, diligence, confidentiality, and loyalty under the rules of professional conduct.

A person who leases property from a tenant under a sublease rather than directly from the landlord.

An agency relationship in which the agent transacts business for a principal without disclosing to the third party that any principal is involved.

A principal for whom an agent acts when the third party has no notice that the agent is acting for a principal at the time of the transaction. The third party therefore believes it is dealing solely with the agent as an individual contracting on its own account.

A classification in agency law of a principal for whom an agent acts when the third party to the transaction has no notice that the agent is acting for any principal at all. The undisclosed principal is a party to the contract made by the agent and may be held liable on it along with the agent.

A principal in whose behalf an agent acts when the third party has no notice that the agent is acting for any principal at all. The third party therefore treats the agent as the sole contracting party.

Excessive or unwarranted in degree or amount.

A showing of excessive cost or difficulty that excuses a party from producing electronically stored information or complying with a subpoena. The responding party must demonstrate inaccessibility due to burden or cost on a motion to compel or for protective order. The court may still order production for good cause or impose conditions to mitigate the burden.

A standard applied in discovery disputes under which a party need not produce electronically stored information or other materials when the burden or expense of production outweighs the likely benefit. The standard also governs work-product protection and subpoena enforcement by requiring a showing of substantial need that cannot be met without undue hardship before compelled disclosure occurs. Courts may issue protective orders or quash subpoenas when compliance would impose such a burden or cost.

A standard in civil discovery that permits a court to limit or deny requests when the cost or difficulty of compliance outweighs the likely benefit, taking into account the needs of the case, the amount in controversy, and the parties' resources.

A limitation on the scope of discovery that excuses a party from producing electronically stored information or complying with subpoenas when the sources are not reasonably accessible because of undue burden or cost. The responding party must demonstrate inaccessibility on a motion to compel or for a protective order. A court may still order production upon a showing of good cause after weighing proportionality factors.

A limitation on discovery obligations that excuses a party from producing electronically stored information or complying with a subpoena when the requested material is not reasonably accessible because of undue burden or cost. The responding party must demonstrate the inaccessibility. A court may still order production upon a showing of good cause while imposing conditions to mitigate expense.

A standard of review that invalidates a state regulation if its purpose or effect is to place a substantial obstacle in the path of an individual seeking to exercise a constitutional right. The test replaced the trimester framework and strict scrutiny of Roe v. Wade. It permits regulations that do not impose such an obstacle even if they have the incidental effect of making the right more difficult or expensive to exercise.

A condition that excuses a party from complying with a discovery request or subpoena when the required production would impose excessive cost or hardship. The party resisting discovery must demonstrate that the information is not reasonably accessible because of the burden or cost. A court may still order production upon a showing of good cause or may impose conditions to mitigate the burden.

A period of time that is excessive or unreasonable under the circumstances when the passage of time prejudices another party or the judicial process.

An element of proof consisting of the exercise of excessive power by one party over another that supplants the latter's free will.

A limit on the duty to provide reasonable accommodations to a qualified handicapped individual. The sponsor of a program or activity need not take steps that would impose excessive financial costs or administrative difficulties on the sponsor.

A significant burden or difficulty that exceeds what is reasonable to require under the circumstances. The standard measures whether an obligation or action would impose excessive cost, effort, or disruption relative to the benefit or need involved.

A showing that a party has substantial need for materials prepared in anticipation of litigation and cannot obtain their substantial equivalent by other means without undue hardship. This showing overcomes qualified work product protection and permits discovery of fact work product while opinion work product remains shielded.

A burden or difficulty that is so substantial that it justifies granting an exception or relief from a legal requirement or rule. The showing requires demonstrating that compliance would impose significant practical or financial strain that cannot reasonably be avoided while still achieving the underlying purpose of the rule.

A doctrine rendering a donative transfer or contract void or voidable when one party exerts unfair persuasion over another who is under the dominant party's control or who justifiably relies on the dominant party to act consistently with the victim's welfare. The persuasion must overcome the victim's free will and cause a transfer or agreement the victim would not otherwise have made.

An excessive or unreasonable burden that a party or person cannot reasonably be expected to bear in complying with a legal obligation or restriction.

An evidentiary danger that arises when the probative value of relevant evidence is substantially outweighed by the risk that it will cause the jury to decide the case on an improper basis such as emotion or bias rather than on the evidence's legitimate probative force.

An excuse from the duty to mitigate damages that applies when the injured party would face excessive risk of further loss, excessive cost or effort, or significant embarrassment or loss of dignity in taking mitigation steps.

A discovery objection or motion asserting that requested electronically stored information or other materials are not reasonably accessible because of undue burden or cost. The responding party must demonstrate inaccessibility on that basis. If shown, the requesting party may still obtain the materials by establishing good cause, after which the court may order production subject to conditions that address the burden.

A procedural rule permitting a party to withhold electronically stored information from discovery when the sources are not reasonably accessible due to undue burden or cost. The responding party must demonstrate inaccessibility on a motion to compel or for protective order. A court may still order production upon a showing of good cause by the requesting party.

A limitation on protected conduct or speech that imposes excessive restrictions relative to the government's asserted interests. The limitation fails constitutional scrutiny when it effectively eliminates access to a right or lacks narrow tailoring.

An individual who has not attained the age of majority and remains subject to parental authority and control. The status prevents the person from exercising certain adult legal capacities such as making irrevocable gifts or wills and limits tort recovery against parents for ordinary negligence arising from family supervision.

Compensation provided by state programs to workers who lose their jobs through no fault of their own. Eligibility requires that the separation from employment not result from misconduct or a voluntary quit without good cause. Denial of these benefits may raise constitutional questions when the worker's conduct stems from sincerely held religious beliefs.

A statutory payment made to eligible workers who lose their jobs through no fault of their own. Eligibility turns on whether the worker's separation from employment satisfies neutral state misconduct or availability rules. The Free Exercise Clause permits denial of these benefits when the worker's religious practice conflicts with a facially neutral and generally applicable condition of employment.

A contract, agreement, provision, or security device that a court will not enforce because of a legal defect. The defect may arise from failure to satisfy a statutory requirement, violation of public policy, or absence of a valid underlying obligation. An unenforceable instrument is not a legal nullity and may still have limited effect if the defect is not raised.

A contract for the breach of which neither the remedy of damages nor the remedy of specific performance is available. The agreement is nonetheless recognized in some other way as creating a duty of performance even without ratification.

A contract for the breach of which neither the remedy of damages nor the remedy of specific performance is available. Such a contract is nonetheless recognized in some other way as creating a duty of performance even without ratification.

The quality of being clear and free from ambiguity or doubt in expression, conduct, or intention.

Conduct or circumstances that are inequitable or prejudicial because they exploit an imbalance, prior misconduct, or risk of harm without legitimate justification. The term identifies situations in which a transaction, evidentiary proffer, or procedural step produces an unjust result that the law will not enforce or admit.

Conduct involving dishonest or fraudulent rivalry in trade and commerce. The doctrine encompasses torts such as passing off goods as those of another, false advertising, misappropriation, and deceptive practices that harm competitors or consumers.

A body of state law that prohibits business practices causing injury to competitors or consumers through deception, misappropriation, or other unfair methods. The doctrine supplies a cause of action that federal courts may hear under supplemental jurisdiction when the claim shares a common nucleus of operative facts with a substantial federal copyright, patent, or trademark claim.

A statutory prohibition under the Federal Trade Commission Act that empowers the FTC to challenge business conduct violating the letter or spirit of the antitrust laws or constituting an incipient violation.

A form of undue influence consisting of persuasion that seriously impairs the weaker party's free and competent exercise of judgment. The doctrine applies when the stronger party dominates the weaker or the relationship justifies the weaker party's assumption that the stronger will act consistently with the weaker's welfare. A contract or donative transfer procured by such persuasion is voidable by the victim.

A risk that relevant evidence will prompt a factfinder to decide a case on an improper basis such as an emotional response rather than the evidence's logical force. The danger arises when evidence invites jury misuse or arouses hostility or sympathy that distorts the evaluative process. Courts weigh this risk against the evidence's probative value under a substantial-outweighing standard.

An inequitable business practice that misrepresents the source of goods or services and injures a competitor by appropriating its goodwill.

Evidence whose admission would create a substantial risk that the jury will decide the case on an improper basis rather than on the evidence's legitimate probative force. The danger arises when the evidence invites the jury to rely on emotion, propensity reasoning, or other considerations outside the proper scope of the issues at trial. A court excludes the evidence only when that risk substantially outweighs the evidence's probative value.

A person who lacks sufficient mental capacity to understand legal proceedings or to manage personal affairs. Courts treat such persons as requiring special procedural protections in litigation and consent rules.

A post-execution or post-formation event that the parties did not reasonably anticipate when creating a legal instrument. Such an event may support equitable relief such as contract modification without fresh consideration or trustee removal when the change is substantial and renders the original terms unfair or impracticable.

A core objective that motivated creation of a trust and that has not yet been realized. The presence of such an objective prevents a court from approving termination or modification of a noncharitable irrevocable trust on the sole basis of unanimous beneficiary consent.

A trust created during the settlor's lifetime to hold life insurance policies on the settlor's life. The settlor retains ownership rights in the policies, leaving the trust unfunded until the policies pay out at death. A will may validly pour assets into the trust even though the trust corpus is minimal or nonexistent at the time of the will's execution.

An inter vivos trust whose sole asset consists of a life insurance policy on the settlor. The policy produces no current income or corpus until the insured dies.

Prior unfair conduct by one party that heightens the coercive force of a later threat and renders the resulting exchange improper under the rules governing economic duress. The conduct need not itself be independently unlawful. It must simply create or exploit a vulnerability that makes the threatened party more likely to assent to unfair terms.

A uniform statute that establishes standards for determining which state court may exercise jurisdiction over child-custody matters and supplies procedures for recognizing and enforcing custody determinations issued by courts of other states.

A model statute that supplies uniform rules for the formation and enforcement of commercial contracts.

A uniform act that supplies rules and presumptions for determining legal parentage of a child. The act addresses parentage in cases of assisted reproduction and surrogacy by directing courts to apply its Article 8 provisions to establish the parent-child relationship.

A model statute providing comprehensive rules for the creation, administration, modification, and termination of trusts. The code supplies default provisions on trustee duties, beneficiary rights, and equitable deviation that apply unless the trust instrument states otherwise.

A requirement or characteristic of being the same or consistent in application across jurisdictions or instances. It ensures equal treatment by mandating identical standards or rules wherever the subject matter arises.

A model statute drafted for enactment by multiple states to achieve consistent legal rules on a given subject across jurisdictions.

A uniform statute that established procedures for determining the legal parentage of a child born outside marriage. The act supplied mechanisms such as acknowledgments, presumptions, and adjudications to fix rights and obligations between parent and child.

Model legislation drafted by the National Conference of Commissioners on Uniform State Laws and proposed for adoption by state legislatures. These acts seek to promote consistency in particular fields of law among enacting jurisdictions, though states frequently modify the promulgated text and universal adoption is rare.

A model statute promulgated to promote uniformity among state adoption laws by supplying jurisdictional rules and procedural standards for adoption proceedings. Most states fill the jurisdictional gap left by the UCCJEA exclusion of adoption either by incorporating the UAA provisions or by extending the UCCJEA to cover adoption petitions.

A uniform statute that supplies jurisdictional rules for adoption petitions in states that have adopted its provisions. Most states fill the gap left by the UCCJEA exclusion of adoption by incorporating the UAA's residency requirements or similar standards.

A uniform statute supplying jurisdictional standards for adoption proceedings that states adopt to address the gap created by the UCCJEA's exclusion of adoption. Most states require the petitioner to reside in the county where the adoption petition is filed.

A uniform state statute that supplies procedures for enforcing arbitration agreements, conducting hearings, and confirming or vacating awards.

A uniform act establishing standards for determining which state court has jurisdiction to make or modify child-custody determinations and for enforcing such determinations issued by other states. The act supplies home-state and significant-connection tests for initial jurisdiction and preserves exclusive continuing jurisdiction in the original forum until specified conditions are met. It also authorizes registration and enforcement of out-of-state orders while limiting modification authority to the court with continuing jurisdiction.

A model statute that establishes standards for determining which state court has jurisdiction to decide child-custody matters and requires recognition of decrees from other states that meet those standards.

A uniform statute that prescribes the jurisdictional standards state courts must apply when determining whether to exercise authority over child custody disputes involving parties in multiple states. The act requires recognition of custody decrees issued by other states when jurisdiction was proper under its criteria. It aims to promote uniformity, prevent conflicting orders, deter abductions, and avoid jurisdictional competition among states.

A uniform act that establishes standards for determining which state court may exercise jurisdiction over child custody and visitation disputes. It prioritizes the child's home state for initial custody determinations and confers continuing exclusive jurisdiction on the court that issued the original order. The act also supplies procedures for registering and enforcing out-of-state custody determinations.

A uniform statute that establishes standards for determining which state has jurisdiction to make or modify a child custody determination and supplies procedures for registering and enforcing custody orders issued by another state.

A uniform statute that establishes jurisdictional standards for initial and continuing child-custody determinations and requires states to recognize and enforce valid out-of-state custody orders. The act supplies rules for registration, temporary enforcement orders, and service on respondents and physical custodians. It expressly excludes adoption proceedings from its coverage.

A uniform statute that governs commercial transactions such as the sale of goods, secured transactions, and negotiable instruments. The statute supplies rules for contract formation, performance, remedies, and security interests in personal property. It has been adopted with minor variations by every state except Louisiana.

A comprehensive statutory framework adopted by states to govern commercial transactions including sales of goods, negotiable instruments, and secured transactions. The code supplies default rules for formation, performance, and remedies in those dealings while distinguishing goods from interests in land.

A statutory rule providing that a purchaser of goods acquires all title the transferor had or had power to transfer. A person with voidable title may pass good title to a good faith purchaser for value. Entrusting possession of goods to a merchant dealing in goods of that kind empowers the merchant to transfer the entruster's rights to a buyer in ordinary course.

A compilation of model rules governing the admissibility of evidence and the conduct of proof at trial. The rules supply standards for authenticating writings, proving the contents of lost documents, and regulating privileges and testimonial compulsion.

A uniform act adopted by all states that creates a single-order system for establishing, enforcing, and modifying child and spousal support orders across state lines. The act supplies jurisdictional rules that determine which tribunal holds continuing exclusive jurisdiction and which state's law governs the nature and duration of the support obligation.

A uniform statute adopted by all states that establishes procedures for establishing, enforcing, and modifying child-support and spousal-support orders when parties reside in different states. The statute allocates continuing exclusive jurisdiction to the issuing tribunal under specified conditions and supplies multiple independent bases for personal jurisdiction over nonresidents.

A model statute drafted for adoption by state legislatures in identical form to promote consistency in state law across jurisdictions.

Laws that Congress is empowered to establish on designated subjects so that the same rules apply throughout the United States.

A model statute that establishes rules for determining legal parentage of children, including through assisted reproduction and surrogacy arrangements, and eliminates distinctions based on legitimacy.

A model statute that establishes rules for determining the existence of a parent-child relationship. It creates presumptions of parentage arising from marriage, cohabitation, and holding out a child as one's own.

A uniform statute that establishes rules for determining the existence of a parent-child relationship. The statute recognizes multiple independent bases for parentage, including giving birth, marital and cohabitation presumptions, voluntary acknowledgments, genetic testing, adoption, and assisted reproduction agreements.

A uniform statute that establishes procedures and presumptions for determining legal parentage of children. The act supplies rules for adjudicating parentage when conception occurs through assisted reproduction or surrogacy.

A uniform statute that supplies the rules for establishing a parent-child relationship. The statute recognizes parentage on multiple independent grounds including birth, marriage or registered partnership at the time of birth, adjudication, adoption, valid acknowledgment, and compliance with assisted-reproduction or gestational-surrogacy provisions.

Uniform laws that supply rules and presumptions for establishing legal parentage of a child. The acts address parentage in cases of assisted reproduction and surrogacy by directing courts to specific provisions for gestational and genetic carriers.

A statutory reform of the rule against perpetuities that retains the validating side of the common-law rule but replaces the invalidating side with a wait-and-see approach under which an interest is valid if it actually vests within a 90-year period.

A constitutional grant of authority to Congress to establish a single nationwide standard governing the conditions under which noncitizens may become citizens. The clause ensures that naturalization criteria remain consistent across all states rather than varying by local law.

A uniform act that supplies a comprehensive statutory framework governing the creation, administration, modification, and termination of trusts. The code supplies default rules on trustee powers and duties, beneficiary rights, spendthrift protections, and equitable deviation that courts apply unless the trust instrument provides otherwise.

A uniform statute that allocates the risk of loss from physical destruction or eminent domain in executory land sale contracts to the seller until possession or title passes to the buyer. The Act displaces the equitable conversion rule that would otherwise place risk on the buyer at contract formation. If the property is destroyed before the buyer takes possession or receives title, the buyer may rescind and recover any payments made.

A uniform statute that allocates risk of loss in executory contracts for the sale of real property. Unless the contract provides otherwise, the statute keeps the risk on the seller until the buyer receives either possession or legal title.

A choice-of-law value that seeks consistent outcomes in multistate disputes regardless of the forum in which the action is brought. It discourages forum shopping by ensuring that the same facts produce the same legal result whether litigated in one state or another. The value supports harmonious interstate relations and protects justified expectations formed in advance of litigation.

An action or agreement undertaken by only one party without requiring reciprocal action or consent from the other. The concept identifies situations where one side alone initiates, accepts, or alters a legal relationship or obligation.

A group of persons joined for a common purpose without formal corporate status.

A non-corporate entity whose citizenship for diversity jurisdiction purposes is that of each of its members. The entity therefore takes on the citizenship of every state in which any member is domiciled rather than receiving a single state of formation or principal place of business.

An aggregate of persons organized for a common nonprofit purpose without formal incorporation whose citizenship for diversity jurisdiction is determined by the citizenship of each member.

A party that lacks the insurance coverage required by statute or contract for the risk at issue. The absence of coverage triggers statutory remedies such as uninsured-motorist benefits or exposes the party to direct liability.

A driver who lacks the liability insurance required by state financial responsibility laws. Such a motorist exposes accident victims to the risk of uncompensated losses because no policy exists to cover damages caused by the driver's negligence.

A form of first-party automobile insurance that compensates an insured for bodily injury or property damage inflicted by an at-fault driver who carries no liability insurance or whose limits fall short of the insured's losses.

An expectation of privacy against government eavesdropping on private conversations. The expectation arises when a speaker takes affirmative steps to exclude uninvited listeners from hearing the words spoken.

An organization formed to negotiate with employers on behalf of workers collectively about job-related issues such as salary, benefits, hours, and working conditions. The organization represents skilled workers in trades and crafts and may engage in collective bargaining, political advocacy, and member services.

The requirement that a prohibited act and the culpable mental state must concur to establish criminal liability. Wrongful intent must accompany the possession or control element. A person who commits the act through misfortune or accident without evil design or culpable negligence has not committed the crime.

A subject matter in which the federal government possesses a distinctively important interest that justifies the development and application of federal common law by federal courts rather than varying state rules. The inquiry focuses on whether the issue involves direct federal obligations or operations where uniformity is essential to protect federal fiscal or sovereign functions.

Issues that implicate uniquely federal interests, such as rules governing the negotiability of checks payable by the United States. Federal common law supplies a uniform judge-made standard rather than varying state laws to protect the need for federal uniformity in matters involving the federal government’s commercial paper.

Authorized shares of a corporation that have not been issued to shareholders, including shares previously issued and later repurchased by the corporation. Such shares remain available for future issuance by the board without altering the rights attached to already outstanding shares.

An interval or measure of time used to fix the duration of an estate or other legal period.

A multilateral treaty that supplies uniform substantive rules for the formation and performance of contracts for the international sale of goods between parties whose places of business are in different contracting states.

A multilateral treaty that supplies uniform rules for contracts for the international sale of goods between parties whose places of business are in different contracting states. The treaty applies when the contract involves goods and the parties are located in signatory nations unless the parties have opted out.

The land-combat and land-operations branch of the United States armed forces. This branch includes supporting air- and water-transport services such as the Army Air Corps and encompasses the Regular Army, the Army Reserve, and the Army National Guard when in active federal service.

A lawyer appointed by the President to represent the federal government in civil and criminal cases in a federal judicial district under the direction of the Attorney General.

A multivolume published codification of federal statutory law. The Code arranges statutes passed by Congress into fifty-three subject titles divided into chapters and sections with continuous numbering within each title.

The supreme law of the land establishing the structure of the federal government, allocating powers among its branches, and protecting individual rights against government infringement. It binds state and federal actors alike and supplies the standard for resolving conflicts between federal and state authority.

A judicial tribunal established by the federal government under Article III of the Constitution or by federal statute to exercise jurisdiction over cases arising under federal law.

An intermediate federal appellate court established in each of the thirteen judicial circuits with authority to review decisions of district courts and certain specialized tribunals within its circuit.

A specialized federal court established under Article I of the Constitution with original nationwide jurisdiction to render money judgments on claims against the United States founded on the Constitution, a federal statute, a federal regulation, an express or implied-in-fact contract, or other claims for damages not sounding in tort.

The federal intermediate appellate courts established in each judicial circuit to review decisions of the district courts within their geographic or subject-matter jurisdiction. These courts sit in panels of three or more judges and issue binding precedent for the trial courts in their circuits.

A federal trial court having jurisdiction within its judicial district.

The trial-level courts of the federal judicial system that exercise original jurisdiction over civil actions arising under federal law and diversity cases exceeding the statutory amount in controversy.

A federal judicial officer appointed under 28 U.S.C. §§ 631–639 who assists district judges by hearing civil and criminal pretrial matters, conducting civil trials and criminal misdemeanor trials when authorized, and performing other duties such as issuing warrants and presiding at initial appearances.

A federal republic consisting of fifty states and the District of Columbia.

The official compilation of decisions issued by the Supreme Court of the United States. Bound volumes contain the authoritative text of each opinion and supply the pagination used in all subsequent citations.

The identical interests and equal rights to possess the whole property that joint tenants must hold. Destruction of these unities severs the joint tenancy.

The four conditions that must exist simultaneously for the creation and continuation of a joint tenancy in real property. Destruction of any one of the conditions by a joint tenant severs the joint tenancy.

The four common-law requirements that must concur for a joint tenancy to arise. Each co-owner must acquire title at the same moment, from the same instrument, with identical fractional shares, and with an equal right to possess the whole property.

The four common-law conditions of time, title, interest, and possession that must coincide for a conveyance to create a joint tenancy. Satisfaction of the unities produces the right of survivorship that distinguishes joint tenancy from tenancy in common.

A requirement for the creation of a joint tenancy at common law. The four unities are interest, possession, time, and title.

A condition in which a corporation and its controlling shareholder exhibit such complete overlap in ownership and control that their separate legal personalities no longer exist. Courts assess this condition through factors including commingling of funds, failure to observe corporate formalities, undercapitalization, and treatment of corporate assets as personal property.

A condition in which the same owner holds title to both the dominant and servient estates. The condition extinguishes an easement appurtenant to the extent the owner can make the same uses by virtue of fee ownership alone.

A doctrine under which an easement is extinguished when the same owner acquires title to both the dominant and servient estates. The extinguishment occurs to the extent the owner can make the same uses by virtue of fee ownership that were previously authorized by the easement. The doctrine prevents the burden from reviving upon later severance of the estates.

A culpable mental state consisting of extreme recklessness toward human life in general. The actor forms an intent to kill on slight provocation while remaining indifferent to the identity of any particular victim. This state supplies implied malice for common-law murder even without a formed purpose to kill or injure a specific person.

A union of persons or things considered as a whole. The concept supplies the foundational idea of a corporation as an artificial legal entity possessing rights and duties separate from its members.

Conduct or behavior that is not becoming of or appropriate to a judge.

An adjective characterizing a result or enrichment that contravenes principles of fairness and equity. It identifies circumstances in which one party obtains a benefit at another's expense without legal or moral justification, triggering restitutionary remedies to restore balance.

A principle requiring restitution to prevent retention of a benefit conferred by another without compensation in circumstances where compensation is reasonably expected. The principle applies when a benefit is obtained not as a gift and not legally justifiable. Courts award restoration of a specific thing or a sum of money to eliminate the enrichment.

A principle requiring restitution when one party receives a benefit at the expense of another without legal justification.

A standard or condition that precludes a particular legal outcome, remedy, or action because it would be unfair or unsuitable under the circumstances.

A condition in which one party has received a benefit at the expense of another without legal justification. Equity requires restitution to restore the parties to their prior positions.

An adjective characterizing conduct, status, or objectives that violate a statute, constitutional provision, common-law rule, or public policy.

Conduct that is not authorized by law or that violates a civil or criminal prohibition.

A common-law doctrine defining the permissible objects of a conspiracy agreement. An agreement to pursue an objective the law deems contrary to the public welfare, or to pursue a lawful goal through prohibited methods, satisfies the objective element even if the goal itself is not criminal.

The crime of entering another's real property by fraud or other illegal means without the owner's consent. This conduct constitutes trespass when the entry lacks permission or legal authority.

Force, including confinement, that is employed without the consent of the person against whom it is directed and whose employment constitutes an offense or actionable tort or would constitute such an offense or tort except for a defense not amounting to a privilege to use the force.

A tort and common-law misdemeanor consisting of the intentional confinement of another within fixed boundaries without the confined person's valid consent or legal justification. The confinement must be complete in all directions and the confined person must be aware of the restraint or harmed by it. Liability extends to those who instigate or participate in the unlawful restraint.

Conduct or methods that the law regards as contrary to public welfare even if not formally criminal. Such conduct supplies the unlawful element when parties agree to pursue an otherwise lawful objective through it, thereby forming a common-law conspiracy.

The condition of being present in the United States without having been admitted or paroled or after the expiration of authorized nonimmigrant status.

Sexual intercourse engaged in without the victim's effective consent under circumstances that the law treats as rendering consent ineffective. Common law and statutory formulations treat consent as ineffective when obtained by force, threat of immediate harm, fraud as to the nature of the act, or when the victim lacks capacity due to unconsciousness or intoxication.

An intentional and unprivileged entry onto land in the possession of another, or a failure to remove a thing after consent or privilege has ended, that subjects the actor to liability irrespective of whether harm results to any protected interest of the possessor.

A statutory qualifier providing that defined terms or rules apply except when surrounding language indicates a contrary intent. The phrase limits the force of a definition or applicability provision to situations where the broader statutory text does not demand a different reading.

The unloading of cargo from a vessel at its intended destination in maritime law.

A biological father who has not married the child's mother but who has formed an ongoing custodial relationship with the child. Due process protects that established parent-child bond from automatic state interference upon the mother's death or other triggering event. The state must afford notice and an opportunity to be heard on fitness before severing custody.

A common-law felony consisting of sodomy or other unnatural sexual acts between persons.

A feature of a pretrial identification procedure that singles out one suspect in a manner likely to produce a mistaken identification. The procedure violates due process when police arrange the suggestiveness and the totality of the circumstances shows a substantial likelihood of irreparable misidentification.

A due process standard that renders an eyewitness identification inadmissible when police procedures create a substantial likelihood of misidentification. The inquiry examines the totality of the circumstances to determine whether the identification nevertheless rests on an independent and reliable source.

A condition or action that is not required or that can be avoided without undue burden or risk. The concept identifies elements or steps that lack necessity under the governing standard and therefore do not justify the associated cost, delay, or intrusion.

A ground for granting a zoning variance when literal enforcement of bulk or use restrictions would impose an undue burden or make compliance impossible or prohibitively expensive for a particular parcel owing to special conditions.

A standard applied in zoning variance cases requiring that strict compliance with the ordinance would cause unnecessary hardship to the property owner. The hardship must relate to the land itself rather than the applicant's business preferences or convenience. Traditional elements include inability to obtain a reasonable return from any permitted use, uniqueness of the property condition, and no alteration of neighborhood character.

A Latin phrase indicating that multiple actions or events occur simultaneously or in a single utterance.

A security interest held by a creditor who has not taken the steps required to establish priority over other creditors. The interest is subordinate to perfected security interests in the same collateral and to certain buyers and lien creditors.

Conduct that violates the ethical standards of a profession, especially when it involves dishonesty, concealment, or actions that reflect adversely on fitness to practice.

Categories of expression that the Supreme Court has identified as falling outside the scope of First Amendment protection. The government may therefore prohibit or regulate speech within these categories without satisfying strict scrutiny. The main categories include obscenity, fraudulent misrepresentation, defamation, advocacy of imminent lawless behavior, fighting words, and child pornography.

A category of speech that receives no First Amendment protection because its content or nature causes harm that outweighs any expressive value. The government may prohibit or regulate speech falling within such a category without satisfying strict scrutiny. Judicial evaluation determines the boundaries of each category to ensure protected expression remains outside its reach.

A category of expression that receives no First Amendment protection and may be regulated or punished consistent with the Constitution. Such categories include fighting words consisting of personally abusive epithets likely to provoke immediate violent retaliation when addressed face to face to an ordinary citizen. Government may not discriminate on the basis of content or viewpoint when regulating within these categories.

An indorsement of a negotiable instrument made by the holder without words limiting the indorser's liability on the instrument.

A present interest in property that confers complete rights of use, management, and disposition without temporal or conditional limitations. The interest endures indefinitely and passes to heirs or successors without restriction upon the holder's death.

An adverb from Law French denoting ever or always.

A factor in the political question doctrine that renders a case nonjusticiable when an unusual need exists for courts to accept without further inquiry a decision already rendered by a coordinate political branch.

A promisee's interest in receiving the benefit of the bargain that the contract was intended to provide but that remains unfulfilled because of a breach.

A standard or condition that deviates from what reason or a reasonable person would accept under the circumstances. The deviation may render an act, risk, fee, or detention impermissible when it lacks rational basis or imposes excessive burden.

A financial hardship that a party or lawyer cannot reasonably be expected to bear when fulfilling a legal obligation such as court-appointed representation or responding to discovery requests.

An element of private nuisance requiring that the gravity of the harm to the plaintiff's use and enjoyment of land outweigh the social utility of the defendant's conduct. The interference must be substantial and not merely the product of the plaintiff's hypersensitivity.

An intentional intrusion, physically or otherwise, upon the solitude or seclusion of another or his private affairs or concerns. The intrusion must be highly offensive to a reasonable person to give rise to liability for resulting harm to the plaintiff's privacy interests.

An equitable consideration that may lead a court to deny specific performance or an injunction when enforcement would cause unreasonable hardship or loss to the party in breach or to third persons.

A ground for quashing or modifying a subpoena when compliance would impose excessive burden or hardship on the recipient.

A restriction imposed on the transfer of an interest in property that courts will not enforce when the benefits of the restriction are outweighed by its interference with the free transferability of the property. Reasonableness turns on weighing the utility of the restraint against the injurious consequences of enforcing it. Use limitations and reasonable rights of first refusal do not qualify as restraints on alienation.

A promise to refrain from competition that is ancillary to a valid transaction or relationship but is greater than needed to protect the promisee's legitimate interest or imposes hardship on the promisor that outweighs that interest and likely injures the public.

A direct restraint on the transfer of property that is invalid when its utility is outweighed by the injurious consequences of limiting alienability. Reasonableness turns on the purpose, scope, and duration of the restraint in light of the policy favoring free transferability of interests in land.

A promise that limits competition in a business or restricts a person from pursuing a gainful occupation. Such a promise is unenforceable on public policy grounds when it is ancillary to a valid transaction or relationship yet greater than needed to protect the promisee's legitimate interest or when the promisee's need is outweighed by hardship to the promisor and likely injury to the public.

A probability of harm that a reasonable person would not accept under the circumstances. The assessment weighs the likelihood and severity of injury against the burden of precautions and the social utility of the conduct or condition.

A condition or course of conduct that a reasonable person would recognize as creating a foreseeable likelihood of physical injury to others. The standard supplies the benchmark for determining when a duty of care arises or when a preexisting duty has been breached.

A government intrusion into an area where a person holds a reasonable expectation of privacy that proceeds without a warrant supported by probable cause or a recognized exception to the warrant requirement.

A constitutional protection that secures persons, houses, papers, and effects against government intrusions lacking probable cause or a warrant. The protection bars searches and seizures that exceed recognized exceptions or lack particularity in their scope. Evidence obtained through such intrusions is subject to exclusion from criminal proceedings.

A constitutional guarantee securing persons, houses, papers, and effects against government intrusions lacking probable cause supported by oath or affirmation and a particular description of the place to be searched and the persons or things to be seized.

A limitation on the scope of discovery that requires a court to restrict requests for information that repeats material already produced or obtainable from a more convenient source. The limitation applies even when the information is relevant and otherwise within the general scope of discovery. Courts must limit the frequency or extent of discovery when the requested material is unreasonably cumulative or duplicative.

A condition or product feature that poses a risk of harm exceeding that which would be contemplated by an ordinary consumer possessing common knowledge about its characteristics. The standard distinguishes inherent or known risks from those that render the item defective for strict liability purposes.

Conduct that creates an unreasonable risk of physical harm to persons or property. The standard measures whether a reasonable person in the actor's position would recognize the danger as excessive and refrain from the conduct or take precautions to mitigate it.

An instrument or interest affecting title to real property that has not been filed in the public records.

A party or individual participating in a legal matter or proceeding without the assistance of counsel. The phrase identifies persons who stand outside the attorney-client relationship and therefore receive distinct protections and restrictions under rules governing lawyer conduct and court procedure.

A condition in the collateral order doctrine under which an interlocutory order qualifies for immediate appeal because the right asserted would be irretrievably lost if review were deferred until final judgment.

A judicial determination incapable of effective appellate review following final judgment in the underlying action. The determination must conclusively resolve a claimed right that stands apart from the merits and would be lost if review were postponed.

An arrestee who is not physically restrained or confined at the time of a search. The status determines whether officers may search a vehicle incident to arrest without a warrant.

An obligation to pay a sum of money that lacks backing by a security interest in specific property of the debtor.

A debt obligation that lacks any collateral or lien securing its repayment. The creditor holds only a personal claim against the debtor and must pursue collection through ordinary judicial proceedings or bankruptcy processes rather than foreclosure against specific property.

A condition of mental deficiency or insanity. In tort, the condition does not relieve an adult actor from liability for conduct that falls below the standard of a reasonable person under like circumstances.

A breach of the landlord's obligations that arises when a change in the condition of leased property, occurring without tenant fault after the lease date, renders the premises unsuitable for the use the parties contemplated. The tenant may then pursue remedies including rent abatement, damages, lease termination, or application of rent to cure the condition.

An archaic designation for a person who wastes or squanders property. In trust law the label identifies a beneficiary whose interest a spendthrift provision shields from both voluntary assignments and involuntary creditor claims.

A false representation concerning a fact that would influence a reasonable person's decision or action in the relevant context. The representation must be objectively untrue and must concern a concrete, verifiable matter rather than mere opinion or prediction.

A set of rare facts that justify departing from a generally applicable legal rule or requirement. The phrase supplies the trigger for discretionary exceptions when ordinary application would produce injustice or impractical results.

A disclosure of personal information or an intrusion into private affairs that lacks adequate justification from a countervailing public interest. The phrase identifies invasions that courts or agencies will not permit because the harm to individual privacy outweighs any asserted benefit from release or access.

An unjustified intrusion into an individual's personal affairs or seclusion that exposes private information without sufficient legal or public justification. The inquiry weighs the harm from the exposure against any countervailing need for the intrusion. Courts apply the standard to determine whether the conduct crosses constitutional or common-law limits.

Evidence consisting of oral testimony, notes, or other non-documentary forms offered to prove facts, the contents of a writing, or the terms of an agreement. Courts apply the original-writing rule and parol evidence doctrine to determine when such evidence may be received in place of or in addition to a writing.

Law sanctioned by custom rather than by enactment in statutes or ordinances. It includes case law derived from judicial decisions that courts ascertain through reason and precedent.

An informal phrase denoting the state of appearing in the presence of a tribunal, judge, or other authorized body for a proceeding. The phrase identifies the forum or officer before whom a party must present itself to answer charges, seek relief, or complete organizational steps required by law.

A uniform statute governing the formation, operation, dissociation, and dissolution of general partnerships. It separates a judgment against the partnership from enforcement against individual partners and requires creditors to satisfy statutory prerequisites before levying on a partner's separate assets.

A judicial or official action that affirms the validity or requires the enforcement of a legal provision, contract, or prior ruling.

A judicial duty requiring judges to decide cases according to the governing legal rules and the evidence presented in the record. The duty extends to managing proceedings so that both sides receive equal opportunity to present and challenge evidence. It prohibits judges from substituting personal experience or off-record information for the law and the facts shown at trial.

Conduct by which a person provides legal advice, prepares legal documents, or instructs clients on legal remedies, procedures, or filing requirements in a jurisdiction where the actor is not authorized to practice law.

The parcel of land benefited by an easement or other servitude. The holder of the upper estate may use the servient estate in a manner reasonably necessary for convenient enjoyment of the servitude, with changes in use permitted to accommodate normal development or technology so long as no unreasonable damage or interference occurs.

A German legal concept that grants authors both economic exploitation rights and moral rights in their literary and artistic works.

A habitual or customary practice in a trade, profession, or locality.

A practice or method of dealing having such regularity of observance in a place, vocation or trade as to justify an expectation that it will be observed with respect to the transaction in question. The usage supplies implied terms or explains existing language when each party knows or has reason to know of the practice and neither knows the other intends something inconsistent with it.

A practice or method of dealing having such regularity of observance in a place, vocation, or trade as to justify an expectation that it will be observed with respect to a particular agreement. It may include a system of rules regularly observed even though particular rules are changed from time to time. Unless otherwise agreed, a usage of trade in the vocation or trade in which the parties are engaged or of which they know or have reason to know gives meaning to or supplements or qualifies their agreement.

A commercial practice having such regularity of observance in a place, vocation, or trade as to justify an expectation that it will be observed with respect to a particular agreement. It may include a system of rules regularly observed even though particular rules are changed from time to time. Unless otherwise agreed, a usage of trade in the vocation or trade in which the parties are engaged or a usage of trade of which they know or have reason to know gives meaning to or supplements or qualifies their agreement.

A usage of trade is a usage having such regularity of observance in a place, vocation, or trade as to justify an expectation that it will be observed with respect to a particular agreement. It may include a system of rules regularly observed even though particular rules are changed from time to time.

An act of employing or applying property, information, force, or other resources for a particular purpose. The concept determines whether a given employment satisfies or violates a legal standard such as trespass, confidentiality, care, or habitability.

A form of immunity that bars the government from introducing a witness's compelled testimony or any evidence derived from it in a later criminal prosecution of that witness. It replaces broader transactional immunity and satisfies the Fifth Amendment privilege against self-incrimination when the government shows the evidence it offers has an independent source.

An interest in land that the law of private nuisance protects against nontrespassory invasions. The interest encompasses the rights of a possessor or owner to use property for ordinary purposes without substantial interference from another's conduct. Liability arises only when the invasion is intentional and unreasonable or otherwise actionable under negligence or strict liability rules.

Compensation owed to a landlord or incoming tenant by a tenant who remains in possession after the lease term ends. The amount equals the prior rental rate unless the landlord or incoming tenant independently proves a different reasonable value for the holdover period.

A recovery available to a landlord or incoming tenant against a tenant who remains in possession after lease termination without consent. The amount equals the reasonable rental value of the premises for the holdover period, measured by the prior rent or by independently proven fair market value when that value differs.

A remedy allowing a landlord or incoming tenant to recover from a tenant who remains in possession after lease termination without consent. Recovery is measured by the prior rental rate or by a different reasonable rental value when independently proven.

An element of adverse possession or prescriptive easement requiring that the claimant's use of land occur without permission from the owner and under an assertion of ownership or right. The use must be hostile in the sense that it proceeds from a good-faith belief that the land belongs to the claimant rather than from any grant or license.

A purpose for which private property may be taken under the Fifth Amendment that is satisfied when the condemnation is intended to permit access or benefit by the general public.

The bona fide placement of a mark on goods or in connection with services that are sold or rendered in interstate commerce. This placement must occur in the ordinary course of trade rather than merely to reserve rights for future use. The requirement fixes the mark to marketed goods or services and serves as a prerequisite for federal trademark registration under the Lanham Act.

Actual employment of a mark on goods or in connection with services in the ordinary course of business to identify and distinguish their source.

Force which the actor uses with the purpose of causing or which he knows to create a substantial risk of causing death or serious bodily harm. The term encompasses both the intentional application of lethal force and conduct creating a high probability of death or grave injury.

An application of physical strength or intimidation that overcomes resistance or constitutes a trespassory breaking. The force must be used either to obtain or immediately retain property or to effect an entry.

A justification defense that permits an actor to use force upon another person when the actor believes that force is immediately necessary to protect against unlawful force by the other on the present occasion.

A quality of having practical value or serving a concrete purpose within a legal rule or doctrine rather than remaining speculative or without application. The standard requires that the thing or arrangement actually accomplish its intended function when employed in the relevant setting.

An individual who employs or exercises a right or thing. The term identifies the person whose use triggers liability, creates reliance interests, or limits prescriptive rights.

A person who uses or consumes a product placed into the stream of commerce by a commercial seller.

An equitable device by which one person held legal title to land for the benefit of another. The arrangement allowed effective devises of freehold estates before the Statute of Wills recognized the power to devise at common law.

An act of using or intermeddling with a chattel in the possession of another. The interference must be meaningful to support liability for trespass to chattels.

An activity or transaction that conforms to the normal customary practices of a particular business or the type of business in which it is engaged.

A collection of promises by a grantor in a deed assuring the grantee of good title and protection against defects. The promises typically include covenants of seisin, right to convey, against encumbrances, quiet enjoyment, warranty, and sometimes further assurance.

A principle that continuous adverse use of land for the statutory period quiets title disputes. The doctrine supplies finality by ending litigation over ownership or servitudes once the required period of uninterrupted possession has run.

The improper assumption or exercise of authority, power, or an opportunity that belongs to another person, institution, or branch of government. The action occurs when one actor takes for itself a function or benefit that the law reserves to another.

A personal servitude in Roman law that grants the holder the right to use another's property without any right to its fruits or produce. The right is strictly limited to personal use and does not extend to alienation or exploitation of the property's output.

A comprehensive uniform statute that codifies the law of trusts. The statute supplies default rules for trust creation, validity, administration, modification, termination, and the duties and powers of trustees and the rights of beneficiaries.

A Latin term denoting each of two parties considered separately in a legal transaction or relationship.

An interest in property consisting of the right to full use and enjoyment of a thing without damage to its substance.

The social value that the law attaches to the interest advanced or protected by conduct. It is weighed against the magnitude of the risk of harm to determine whether the risk is unreasonable and the conduct is negligent or constitutes an unreasonable invasion of another's interest in the use and enjoyment of land.

A high degree of care that a prudent person exercises in dealing with very important personal affairs or that a professional exercises in a given situation.

A contractual obligation requiring each party to a contract or partnership agreement to perform and enforce its duties honestly and fairly without undermining the agreed allocation of risks and benefits. The obligation is mandatory and cannot be eliminated by agreement though parties may prescribe reasonable standards for measuring compliance.

A contractual obligation requiring each party to act honestly and fairly when performing and enforcing an agreement. The duty prevents a party from taking actions that deprive the other of the expected benefits of the bargain even when the contract language permits literal compliance.

A heightened fiduciary standard requiring complete honesty, loyalty, and fairness in all dealings between parties in close relationships such as partners or shareholders in closely held corporations. The standard prevents one party from using control or information advantages to obtain benefits at the expense of the other. It operates as an implied term in every contract and partnership agreement that limits the exercise of discretion to undermine the expected benefits of the bargain.

An elevated fiduciary standard of conduct requiring partners, general partners, members of member-managed limited liability companies, and shareholders in close corporations to discharge their responsibilities with the finest loyalty and to refrain from self-dealing or appropriating enterprise opportunities without disclosure and consent. The standard forbids conduct that would be permissible at arm's length and demands that fiduciaries hold as trustee for the enterprise any property, profit, or benefit derived from the conduct of its affairs.

An extreme and outrageous conduct standard that exceeds all possible bounds of decency and is regarded as atrocious. The standard requires conduct so far outside tolerable behavior that it produces severe emotional distress in the target or certain bystanders.