/ Dictionary / Index D Dies Committee: Meaning and Definition of Find definitions for: Dies' Commit"tee Pronunciation: [key] — U.S. Hist. U.S. Hist. an early, informal name for the House Un-American Activities Committee. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Dies diesel Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language