The best replacement for biannual is biennial.

The best alternatives to biannual are rated as following:
★★★★★  biennial
★★★  semiannual
★★  semi annual
★  bi-annual
★  biyearly
★  bi annual
  annual
  semi-annual
  every other year

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No companions for biannual have been suggested so far.
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Google Trends

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biannual
biennial
semiannual