plant living two years. Usually grows vegetatively the first year. then flowers and fruits the second year (compare to annual and perennial).
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Biennial means (an event) lasting for two years or occurring every two years.
In particular, it can refer to:
- Biennial plant, a plant which blooms in its second year and then dies
- Biennale, the Italian word for "biennial" and a term used within the art world to describe an international exhibition of contemporary art, stemming from the use of the phrase for the Venice Biennale. (The English form, "biennial", is also commonly used to describe these art events.)