/ Dictionary / Index B B-1: Meaning and Definition of Find definitions for: B-1 Pronunciation: (bē'wun'), [key] — pl. B-1's. a U.S. long-range bomber, having sweptback wings and a subsonic cruising speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. B, b B-1 Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language