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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.
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Biennial (adjective)
Happening every two years.
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Biennial (adjective)
Lasting for two years.
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Biennial (noun)
A germinating and growing in its first year, then producing its flowers and fruit in its second year, after which it usually dies.
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Biennial (adjective)
taking place every other year
“the first of a series of biennial exhibitions”
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Biennial (adjective)
(of a plant) taking two years to grow from seed to fruition and die.
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Biennial (noun)
a biennial plant.
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Biennial (noun)
an event celebrated or taking place every two years
“the top antiques fairs are the Milan and Florence biennials”