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Semiannual (adjective)
Biannual: occurring twice a year
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Semiannual (noun)
Something occurring twice each year.
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Biannual (adjective)
Occurring twice a year; semiannual.
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Biannual (adjective)
Occurring once every two years; biennial.
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Biannual (noun)
Something occurring twice each year.
Wiktionary