/ Dictionary / Index H helpful: Meaning and Definition of Find definitions for: help•ful Pronunciation: (help'ful), [key] — adj. giving or rendering aid or assistance; of service: Your comments were very helpful. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: helpful (Thesaurus) helper T cell helping 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