Definition of "biannual" [bi•an•nu•al]

• Happening twice each year; semiannual. (adjective)
• Occurring every two years; biennial. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "One critic sardonically called the biannual architecture show now up in Venice "the biggest, most glamorous architecture show on earth.""
• "The children came two years apart, as regular as some kind of biannual publication; Looloo, seventeen, being the youngest, and also the best-looking and the most popular in the family."
• "Montgomery County uses WOW's formula in gathering information for its biannual report on how much income is needed to be "self-sufficient" and live in the county without government assistance."