Written by attorneys · grounded in primary & secondary sources — see below
A Latin phrase denoting matters or claims that arise from a single integrated transaction or occurrence. The phrase supplies the doctrinal link that permits joinder of parties or claims, coordinated interpretation of multiple writings, and recognition of purchase-money status for mortgages executed at the moment of acquisition.
Sources & Authorities
How it applies
Common Examples
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Co-Plaintiffs Join Product Claims
Iris Irons and Ivan Ivanov each bought the same model of defective pacemaker from Interlink Communications. After both devices failed within weeks of implantation, they filed a single federal complaint asserting negligence and warranty claims. Because their injuries stemmed from the identical manufacturing and distribution sequence, the court permitted them to proceed as co-plaintiffs under the governing joinder standard.
Letter and Email Read as One
Isabella Ingram sent Ideal Solutions a signed letter offering to sell a warehouse and later emailed the same buyer an addendum adjusting the closing date. When a dispute arose over which price controlled, the court examined both documents together because they formed part of the identical negotiation and closing sequence.
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Cases
Federal Rules
Uniform Acts
Restatements
Dictionaries
Construction Loan Qualifies as Purchase Money
Ibrahim Iqbal purchased vacant land from Imperial Motors and simultaneously borrowed from Innovate Pharmaceuticals to finance both the purchase price and immediate site preparation. The lender recorded a mortgage at closing. Because the funds were advanced as part of the single acquisition transaction, the mortgage received purchase-money priority over a later judgment lien against Iqbal.
State Claim Joined with Federal Claim
Igor Ito sued in federal court alleging securities fraud and added a state-law breach-of-contract count arising from the identical stock-purchase agreement. The federal and state claims shared the same operative facts concerning the seller's representations and the buyer's reliance, so the court exercised discretion to hear the state claim alongside the federal claim.
Multiple Writings Satisfy Statute of Frauds
Isaiah Ishikawa signed a purchase-order form for machinery and later initialed a separate delivery schedule that referenced the same equipment. When the seller sought to enforce the deal, the court treated the two documents as a single memorandum because the circumstances showed they concerned the identical transaction.
Replacement Mortgage Keeps Priority
After refinancing, Interlink Communications released its original senior mortgage on a factory and simultaneously recorded a new mortgage containing identical terms. Because the replacement occurred as part of the same transaction, the new mortgage retained the original priority against intervening junior interests.
Common questions
Frequently Asked
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When do multiple documents count as part of the same transaction for contract interpretation?+
Writings are treated as a single integrated transaction when the circumstances show they were executed together to accomplish one economic objective. Courts therefore read them together even if they contain no internal cross-reference.
Supporting sources
What makes a mortgage a purchase-money mortgage under the Restatement?+
A mortgage qualifies when its proceeds are used to acquire title or to construct improvements and the mortgage is given as part of the same transaction in which title is acquired. Both seller-financed and third-party loans can meet this test.
Supporting sources
How does the same-transaction requirement affect joinder of plaintiffs?+
Plaintiffs may join when their rights to relief arise out of the same transaction or occurrence. The test focuses on whether the claims share a common nucleus of operative facts rather than on whether the plaintiffs suffered identical injuries.
Supporting sources
Does a replacement mortgage executed at the same time as the release of the original retain priority?+
Yes, provided the release and new mortgage are part of one continuous transaction. The new mortgage steps into the priority position of its predecessor unless the modification materially prejudices junior interests.
Supporting sources
[326 U.S.] at 110Conflict of Laws
…as it would be if tried in a State court. The nub of the policy that underlies Erie R. Co. v. Tompkins is that for the same transaction the accident of a suit by a non-resident litigant in a federal court instead of in a State court a block away, should not lead to a substantially different result. And so, putting to one…