WordReference Random House Learner's Dictionary of American English © 2017
bi•an•nu•al /baɪˈænyuəl/USA pronunciation   adj. 
  1. occurring twice in one year.
  2. occurring once every two years.
bi•an•nu•al•ly, adv. See -ann-.
    See bi-.

WordReference Random House Unabridged Dictionary of American English © 2017
bi•an•nu•al  (bī anyo̅o̅ əl),USA pronunciation adj. 
  1. occurring twice a year;
  2. occurring every two years;
bi•annu•al•ly, adv. 
  • bi-1 + annual 1875–80
    See  bi-1. 

Collins Concise English Dictionary © HarperCollins Publishers::

biannual /baɪˈænjʊəl/ adj
  1. occurring twice a year
    Compare biennial

biˈannually adv

'biannual' also found in these entries:

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