Biannual Definition

bī-ănyo͝o-əl
bi-annual
adjective
Occurring twice each year; semiannual.
American Heritage
Coming twice a year; semiannual.
Webster's New World
Occurring every two years; biennial.
American Heritage
The definition of biannual is something that occurs twice per year.
When a race is held in the spring and again in the fall, this is an example of a biannual race.
YourDictionary

Occurring twice a year; half-yearly; semiannual, twice-yearly.

Wiktionary
Synonyms:
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noun
Something occurring twice each year.
Wiktionary

Other Word Forms of Biannual

Noun

Singular:
biannual
Plural:
biannuals

Origin of Biannual

  • bi- +‎ annual

    From Wiktionary

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biannual