/ Dictionary / Index G groundbreaker: Meaning and Definition of Find definitions for: ground•break•er Pronunciation: (ground'brā"kur), [key] — n. a person who is an originator, innovator, or pioneer in a particular activity. an original idea, product, or the like that leads to or makes possible further developments, growth, improvements, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: groundbreaker (Thesaurus) ground beetle groundbreaking Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language