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Old 16th Oct 2014, 12:55
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pohm1
 
Join Date: Jul 2002
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Oxford Dictionary

Usage

Biennial and biannual are often confused. Biennial means ‘occurring every two years’ ( the biennial Ryder Cup tournament), while biannual means ‘twice a year’ ( the solstice is a biannual event). See also bi- (usage).
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