/ Dictionary / Index B bidirectional: Meaning and Definition of Find definitions for: bi•di•rec•tion•al Pronunciation: (bī"di-rek'shu-nl, -dī-), [key] — adj. capable of reacting or functioning in two, usually opposite, directions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bidirectional (Thesaurus) bidialectal bidonville 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