/ Dictionary / Index F Federal Bureau of Investigation: Meaning and Definition of Find definitions for: Fed'eral Bu'reau of Investiga'tion. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Federal Aviation Administration Federal Capital Territory Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language