/ Dictionary / Index M modifier: Meaning and Definition of Find definitions for: mod•i•fi•er Pronunciation: (mod'u-fī"ur), [key] — n. a person or thing that modifies. a word, phrase, or sentence element that limits or qualifies the sense of another word, phrase, or element in the same construction. the immediate constituent of an endocentric construction that is not the head. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: modifier (Thesaurus) modified American plan modify Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language