/ Dictionary / Index P promisor: Meaning and Definition of Find definitions for: prom•i•sor Pronunciation: (prom"u-sôr', prom'u-sôr"), [key] — n. Law. a person who makes a promise. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: promisor (Thesaurus) promising promissory Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language