/ Dictionary / Index S suppletion: Meaning and Definition of Find definitions for: sup•ple•tion Pronunciation: (su-plē'shun), [key] — n. Gram. the use in inflection or derivation of an allomorph that is not related in form to the primary allomorph of a morpheme, as the use of better as the comparative of good. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supplementation suppletive Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language