/ Dictionary / Index C complementary: Meaning and Definition of Find definitions for: com•ple•men•ta•ry Pronunciation: (kom"plu-men'tu-rē, -trē), [key] — adj., n., pl. -ries. —adj. forming a complement; completing. complementing each other. —n. See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: complementary (Thesaurus) complementarity principle complementary angle Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language