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There are 16 words containing IANNUAL

biannual — adj. Occurring twice a year; semiannual. — adj. (Proscribed) Occurring once every two years; biennial. — n. Something occurring twice each year.
bi-annual — adj. Alternative spelling of biannual.
biannually — adv. Taking place twice per year, semiannually. — adv. Taking place every two years, biennially.
biannuals — n. Plural of biannual.
multiannual — adj. Relating to more than one year.
multiannually — adv. In a multiannual manner.
pluriannual — adj. Covering more than one year.
pluriannually — adv. In a pluriannual manner.
semiannual — adj. Biannual: occurring twice a year. — n. Something occurring twice each year.
semi-annual — adj. Alternative spelling of semiannual.
semiannually — adv. In a semiannual manner, twice yearly.
semi-annually — adv. Occurring twice yearly; biannually.
semiannuals — n. Plural of semiannual.
sesquiannual — adj. Occurring once every one and a half years (i.e. once every 18 months).
triannual — adj. Happening three times each year.
triannually — adv. (Uncommon) Three times per year. — adv. (Proscribed) Occurring every three years; triennially.

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