Adjectives

(s)biennial, biyearlyoccurring every second year“they met at biennial conventions”
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(s)semiannual, biannual, biyearly, half-yearlyoccurring or payable twice each year
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Adverbs

(r)biennially, biyearlyevery two years“this festival takes places biennially”
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(r)semiannually, biyearlytwice a year
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