Yes, those phrases mean the same thing.
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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."
Biannual
The word is "Biennial".
It is a triennial event. A triennial event happens three times a year.
You need to renew your AAA membership every year. I have been a customer of AAA for couple of years. They have good service.