Definition of biannual adjective from the Oxford Advanced Learner's Dictionary

 

biannual

 adjective
adjective
BrE BrE//baɪˈænjuəl//
 
; NAmE NAmE//baɪˈænjuəl//
 
[only before noun]
 
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happening twice a year a biannual meeting compare annual see also biennial
See the Oxford Advanced American Dictionary entry: biannual