Dictionary of English - biannual or biennial

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A biannual event happens twice a year: We make a biannual visit to the in-laws: once at Christmas and again in the summer. A biennial event happens every two years: The school was due for its biennial inspection. (A biennial plant lasts two years.)

The central band was originally red. It was changed to blue to express solidarity with the Allies during World War I. Effective date: 28 September 1917. >>