BIANNUAL

semiannual, biannual, biyearly, half-yearly

(adjective) occurring or payable twice each year

Source: WordNet® 3.1

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Etymology

Adjective

biannual (not comparable)

Occurring twice a year; semiannual.

(proscribed) Occurring once every two years; biennial.

Usage notes

Although biannual conventionally means twice a year, its conflation with biennial (once every two years) is quite common.

Synonyms

• half-yearly

• semiannual

• twice-yearly

Noun

biannual (plural biannuals)

Something occurring twice each year.

Source: Wiktionary

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Bi*an"nu*al, a. [Pref. bi- + annual.]

Definition: Occurring twice a year; half-yearly; semiannual.

Source: Webster’s Unabridged Dictionary 1913 Edition

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