Breadcrumb Home > Dictionary > Index C complemental: Meaning and Definition of Find definitions for: com•ple•men•tal Pronunciation: (kom"plu-men'tl), [key] — adj. complementary; completing. accomplished. ceremonious. complimentary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: complemental (Thesaurus) complement complementarity ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language