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Old 16th October 2014 | 12:55
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pohm1
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From: Canberra, Australia
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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