A legal action in common law for breach of an oral or written contract; a suit brought to recover damages for failure to fulfill a promise.
From Latin 'assumpsit' (he/she undertook), the third-person singular of 'assumere.' This legal term was brought into English common law from medieval Latin and became a standard term in the English legal system for a specific type of contractual dispute.
Assumpsit was revolutionary in English legal history: it allowed people to sue for broken promises even without a formal deed or seal, democratizing contract law so ordinary merchants and workers could enforce agreements—it's why modern contract law exists! Medieval lawyers literally called it 'the action of assumpsit' because it was so important.
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