/ Dictionary / Index B Bureau of Internal Revenue: Meaning and Definition of Find definitions for: Bu'reau of Inter'nal Rev'enue Pronunciation: [key] former name of the Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bureau of Indian Affairs Bureau of Land Management Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language