bi annual

biannual

[bahy-an-yoo-uhl]
adjective
1.
occurring twice a year; semiannual.
2.
occurring every two years; biennial.

Origin:
1875–80; bi-1 + annual

biannually, adverb

biannual, biennial, semiannual (see usage note at bi-).


See bi-1.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biannual (baɪˈænjʊəl)
 
adj
Compare biennial occurring twice a year
 
bi'annually
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

biannual
also bi-annual; "every six months," 1877, from bi- + annual.
Online Etymology Dictionary, © 2010 Douglas Harper
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