Hypertext Webster Gateway: "promissory"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Promissory \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}.
--Kent. Byles. Story.
From WordNet (r) 1.7 (wn)
promissory
adj : relating to or having the character of a promise;
"promissory note"
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