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promissory (adj.)

mid-15c., promissorie, "conveying or containing a promise," from Medieval Latin promissorius, from Latin promissus, past participle of promittere (see promise (n.)). The legal promissory note, a signed document containing a written promise to pay a specified sum to certain persons, is recorded by 1670s.

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Definitions of promissory from WordNet

promissory (adj.)
relating to or having the character of a promise;
promissory note
From wordnet.princeton.edu