Biennial

Part of speech: noun (n.)

1. Something which takes place or appears once in two years; esp. a biennial examination.

2. A plant which exists or lasts for two years.

Part of speech: adjective (a.)

1. Happening, or taking place, once in two years; as, a biennial election.

2. Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.