- The definition of biannual is something that occurs twice per year.
When a race is held in the spring and again in the fall, this is an example of a biannual race.
- biannually adverb
Used by arrangement with John Wiley & Sons, Inc.
- Happening twice each year; semiannual.
- Occurring every two years; biennial.
- bi·anˈnu·al·ly adverb