Difference Between Biannual,Biennial and PerennialBiannual means occurring twice a year; semiannual: “The Ladakh festival takes place on a biannual basis, once in February and then in August.”
Biennial means ccurring every two years: “Electing for the seat of mayor occurs on a biennial basis.”
Perennial means persistent over a period of several years; continuing without interruption: “The rains have been perennial in this part of the country over the last few years.”

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