semiannual

[sem-ee-an-yoo-uhl, sem-ahy-]
adjective
1.
occurring, done, or published every half year or twice a year; semiyearly.
2.
lasting for half a year: a semiannual plant.

Origin:
1785–95; semi- + annual

semiannually, 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
semiannual (ˌsɛmɪˈænjʊəl)
 
adj
1.  occurring every half-year
2.  lasting for half a year
 
semi'annually
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Payments may be made annually, semiannually, or quarterly.
Data are obtained semiannually through telephone surveys.
The committee shall semiannually authorize distribution of money from the fund
  to eligible public safety agencies or counties.
Until that date, the corporation usually pays you a stated rate of interest,
  generally semiannually.
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