from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Lasting or living for two years.
- adj. Happening every second year.
- adj. Botany Having a life cycle that normally takes two growing seasons to complete.
- n. An event that occurs every two years.
- n. 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.
- n. Botany A perennial plant, such as the English daisy, cultivated as a biennial.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Happening every two years.
- adj. Lasting for two years.
- n. A plant that requires two years to complete its life-cycle, germinating and growing in its first year, then producing its flowers and fruit in its second year, after which it usually dies.
from the GNU version of the Collaborative International Dictionary of English
- adj. Happening, or taking place, once in two years.
- adj. Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
- n. Something which takes place or appears once in two years; esp. a biennial examination.
- n. A plant which exists or lasts for two years.
from The Century Dictionary and Cyclopedia
- Happening or taking place once in two years: as, biennial games.
- Continuing or lasting for two years; changed or renewed every two years: Said especially of plants.
- n. A plant which requires two seasons of growth to produce its flowers and fruit, growing one year and flowering, fruiting, and dying the next.
- n. An exercise, as a college examination, occurring once in two years. Sometimes also bisannual.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. occurring every second year
- adj. having a life cycle lasting two seasons
- n. (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season
From Latin biennium ("two-year period"), from bis ("two") + annus ("year"). (Wiktionary)