Dictionary
bi•en•ni•al
Pronunciation: (bī-en'ē-ul), [key]—
adj.
1. happening every two years:
biennial games.
2. lasting or enduring for two years:
a biennial life cycle.
3. Bot.completing its normal term of life in two years, flowering and fruiting the second year, as beets or winter wheat.
—
n.
1. any event occurring once in two years.
2. Bot.a biennial plant.
Also,biyearly (for defs. 1, 2).Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.