D defs.my
Entry 1 sense Webster, 1913

Promissory

/präm'-əs-ôrˌ-ē/ · Prom·is·so·ry · IPA /ˈpɹɑmɪsɔɹi/
01 a. Containing a promise or binding declaration of something to be done or forborne.
  1. 1.
    Containing a promise or binding declaration of something to be done or forborne.
Phrases & compounds
Promissory note — 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.