biannual UK /bʌɪˈanjuːəl/US /baɪˈænjuəl/adjective 2noun 1forms 1 adjective2 •Occurring twice a year; semiannual.Collection of papers presented at the workshops during the 1988 biannual symposia in February (New Orleans) and May (Innsbruck). — 1989 •(nonstandard) Occurring once every two years; biennial. noun1 •Something occurring twice each year.It was a biannual from April 1970 to October 1977 and has been a quarterly since fall 1978. — 1995 formsbiannuals
