Question

an event which happens once in two year .

Answer 1

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.

Answer 2

Answer:

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.