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biannual

[bahy-an-yoo-uh l] /baɪˈæn yu əl/
adjective
1.
occurring twice a year; semiannual.
2.
occurring every two years; biennial.
Origin of biannual
1875-1880
1875-80; bi-1 + annual
Related forms
biannually, adverb
Can be confused
biannual, biennial, semiannual (see usage note at bi-)
Usage note
See bi-1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for biannual

biannual

/baɪˈænjʊəl/
adjective
1.
occurring twice a year Compare biennial
Derived Forms
biannually, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for biannual
adj.

also bi-annual; "occurring every six months, twice a year," 1837, from bi- + annual. Related: Biannually; bi-annually.

Online Etymology Dictionary, © 2010 Douglas Harper
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10
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