Biannual Definition
 bī-ănyo͝o-əl 
  bi-annual
  
    adjective
  
 Occurring twice each year; semiannual.
 American Heritage 
Coming twice a year; semiannual.
 Webster's New World 
Occurring every two years; biennial.
 American Heritage 
Occurring twice a year; half-yearly; semiannual, twice-yearly.
Wiktionary 
(proscribed) Occurring every two years; biennial.
Wiktionary 
Synonyms: 
  
    noun
  
 Something occurring twice each year.
 Wiktionary 
Other Word Forms of Biannual
Noun
Singular:
 biannualPlural:
 biannualsOrigin of Biannual
-  
bi- + annual
From Wiktionary
 
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