/ Dictionary / Index C complainant: Meaning and Definition of Find definitions for: com•plain•ant Pronunciation: (kum-plā'nunt), [key] — n. a person, group, or company that makes a complaint, as in a legal action. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: complainant (Thesaurus) complain complaint Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language