Prŏm'is-so-ry, a.

(50), a. [It. promissorio, Sp. promisorio.] 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, a certain sum of money, absolutely and at all events;—frequently called a note of hand. Kent. Byles. Story.