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Definition of ASSUMPSIT
: an express or implied promise or contract not under seal on which an action may be brought
a: a former common-law action brought to recover damages alleged from the breach of an assumpsit
b: an action to recover damages for breach of a contract
Origin of ASSUMPSIT
New Latin, he undertook, from Latin assumere to undertake
First Known Use: 1590
(Latin: he has undertaken) In common law, an action to recover damages for breach of contract, especially an implied or quasi contract. It developed in early English law as a form of recovery for the negligent performance of an undertaking (e.g., failing to protect from damage another's goods in one's care). Eventually, it came to cover broader claims regarding failure to keep a promise. It remains available as a contractual remedy in some U.S. jurisdictions.