[ bahy-an-yoo-uhl ]
See synonyms for biannual on
  1. occurring twice a year; semiannual.

  2. occurring every two years; biennial.

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Origin of biannual

First recorded in 1875–80; bi-1 + annual

confusables note For biannual

See bi-1.

Other words from biannual

  • bi·an·nu·al·ly, adverb

Words that may be confused with biannual

Words Nearby biannual Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use biannual in a sentence

British Dictionary definitions for biannual


/ (baɪˈænjʊəl) /

  1. occurring twice a year: Compare biennial

Derived forms of biannual

  • biannually, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012