/ Dictionary / Index F fifth estate: Meaning and Definition of Find definitions for: fifth' estate' Pronunciation: [key] any class or group in society other than the nobility, the clergy, the middle class, and the press. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fifth dimension fifth force Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language