Does bi-annual mean once every two years or twice a year?

Biannual, and Semiannual means twice a year.

Biennial means lasting two years, or occurring every other year.
twice a year

bi- means split into two among other meanings

but it's weird because bicentennial is 200 years! the English language is confusing
Once every two years.

Semi annual is twice a year
twice a year.
It means happening twice a year.
bi =2 annual = year= hope that helps
It can mean both twice a year or once every 2 years.
twicw a year
Every two years

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