/ Dictionary / Index B back clearance: Meaning and Definition of Find definitions for: back' clear"ance Pronunciation: [key] runout (def. 1b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. back-check back clipping Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language