biannual

Etymology
.

Adjective

 * 1) Occurring twice a year; semiannual.
 * 2)  Occurring once every two years; biennial.
 * 1)  Occurring once every two years; biennial.
 * 1)  Occurring once every two years; biennial.
 * 1)  Occurring once every two years; biennial.
 * 1)  Occurring once every two years; biennial.
 * 1)  Occurring once every two years; biennial.

Usage notes
Although biannual conventionally means twice a year, its conflation with (once every two years) is quite common (among both readers and writers), leading to usage advice that it is better to write either  or  (whichever is meant), or even more clearly, to write either twice a year or once every two years, than to write biannual at all.

Translations

 * Dutch:
 * Finnish:
 * Galician: bianual
 * German:
 * Greek: ,
 * Hungarian:
 * Irish: leathbhliantúil
 * Italian: semestrale
 * Norwegian: halvårlig, halvårs-
 * Portuguese: bianual
 * Russian:
 * Spanish:

Noun

 * 1) Something occurring twice each year.