Added 9 October 2026 biannual /bʌɪˈanjuːəl/ adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about biannual at Wordnik → Where our words come from → Occurring twice a year; semiannual. Occurring once every two years; biennial. noun Something occurring twice each year. Related Words: semiannualbiyearlybiennialhalf-yearlybiennalebi-annualyearlyquarterlybienniumtwicesemi-annualhalf Back to today's word