adv : every two years; "this festival takes places biennially" [syn: biyearly]
cf. biennial
adj.
Lasting or living for two years.
Happening every second year.
Botany. Having a life cycle that normally takes two growing seasons to complete.
n.
An event that occurs every two years.
Botany.
A plant that normally requires two seasons to complete its life cycle, growing usually as a rosette in the first season and producing flowers and fruits and then dying in the second season.
A perennial plant, such as the English daisy, cultivated as a biennial.