/ Dictionary / Index B binal: Meaning and Definition of Find definitions for: bi•nal Pronunciation: (bīn'l), [key] — adj. double; twofold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bin binarity Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language