Bi*en"ni*al (?), a. [L. biennalis and biennis, fr. biennium a space of two years; bis twice + annus year. Cf. Annual.]
1.
Happening, or taking place, once in two years; as, a biennial election.
2. Bot.
Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
© Webster 1913.
Bi*en"ni*al, n.
1.
Something which takes place or appears once in two years; esp. a biennial examination.
2. Bot.
A plant which exists or lasts for two years.
© Webster 1913.