- occurring twice a year; semiannual.
- occurring every two years; biennial.
Origin of biannual
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for biannually
The economic assessment of the country is assessed quarterly and biannually.After the Rain
- occurring twice a yearCompare biennial
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
Word Origin and History for biannually
Online Etymology Dictionary, © 2010 Douglas Harper