/ Dictionary / Index E explement: Meaning and Definition of Find definitions for: ex•ple•ment Pronunciation: (ek'splu-munt), [key] — n. Math. the quantity by which an angle or an arc falls short of 360° or a circle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. explant explementary angle Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language