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Definition of biennial:

  1. A plant which exists or lasts for two years.
  2. Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
  3. Happening, or taking place, once in two years; as, a biennial election.
  4. Something which takes place or appears once in two years; esp. a biennial examination.


half-yearly, biannual, semiannual, biyearly, two-year, biannual.

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