prom·is·so·ry /ˈprɑməˌsori, ˌsɔr-/
(a.)約定的,約好的,約定支付的
Prom·is·so·ry a. Containing a promise or binding declaration of something to be done or forborne.
Promissory note Law, a written promise to pay to some person named, and at a time specified therein, or on demand, or at sight, a certain sum of money, absolutely and at all events; -- frequently called a note of hand.
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promissory
adj : relating to or having the character of a promise;
"promissory note"