Word parts bi- + annual Pronunciation (UK) IPA (key): /bʌɪˈanjuːəl/ (US) IPA (key): /baɪˈænjuəl/ Audio (AU)(file) Hyphenation: bi‧an‧nu‧al Adjective Positive biannual Comparative none Superlative none A biannual event is an event that occurs twice a year.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads