1. 
   biannually
   [adv] - twice a year
   Found op http://www.webdictionary.co.uk/definition.php?query=biannually
   
   
2. 
   biannually
   adverb twice a year; `we hold our big sale biannually`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=biannually
   
   
3. 
   biannually
   a confusing expression of frequency. The word is used both for twice a year and for once every two years, so it should be avoided. Twice a year is semiannually and once every two years is biennially.
   Found op http://www.unc.edu/~rowlett/units/dictB.html
   
   
4. 
   biannually
   1) Twice a year
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/biannually/1
   
   

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