Biannual~ this means twice in one year
biennial~ this means once every two years
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Biennial means "occurring every two years," OR "lasting for two years." The word biannual can also mean "occurring every two years," although its most common meaning is "occurring twice a year."
Biennial or biannual can refer to something which happens every two years.
Something that happens every three years is a triennialevent.
Sextennial means "Recurring every six years."
Something that happens every six years is sexennial.