/ Dictionary / Index A all-important: Meaning and Definition of Find definitions for: all-im•por•tant Pronunciation: (ôl'im-pôr'tnt), [key] — adj. extremely or vitally important; essential. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: all-important (Thesaurus) alligator wrench all-in Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language