/ Dictionary / Index B biannual: Meaning and Definition of Find definitions for: bi•an•nu•al Pronunciation: (bī-an'y-ul), [key] — adj. occurring twice a year; semiannual. occurring every two years; biennial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biannual (Thesaurus) biangular biannulate Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language