/ Dictionary / Index B big beat: Meaning and Definition of Find definitions for: big' beat' Pronunciation: [key] — Slang. (sometimes caps.)Slang. rhythmic popular music, esp. rock-'n'-roll, notable for its prominent and persistent beat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. big bang theory Big Belt Mountains Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language