Occurring two times per year
Dentists strongly recommend receiving a biannual checkup to ensure a good well-being.
by Define_That_Word January 1, 2018
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"What's the occasion?"
"It's my biannual bash!"
by hetnix February 19, 2021
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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.
by JohnnyBlueEyes November 23, 2011
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