biannual

Occurring two times per year

Dentists strongly recommend receiving a biannual checkup to ensure a good well-being.

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biannual bash

half-birthday party

"What's the occasion?"
"It's my biannual bash!"

Biannual Santa Claus

Someone who comes down your chimney twice a year.

i.e. a sexual encounter that happens twice a year.

Biannual Santa Claus comes but twice a year.

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