||As*sump"sit (?; 215), n. [L., he undertook,
pret. of L. assumere. See Assume.] (Law)
(a) A promise or undertaking, founded on a
consideration. This promise may be oral or in writing not under seal. It
may be express or implied. (b) An action to
recover damages for a breach or nonperformance of a contract or promise,
express or implied, oral or in writing not under seal. Common or
indebitatus assumpsit is brought for the most part on an implied
promise. Special assumpsit is founded on an express promise or
undertaking. Wharton.