- happening every two years: biennial games.
- lasting or enduring for two years: a biennial life cycle.
- Botany. completing its normal term of life in two years, flowering and fruiting the second year, as beets or winter wheat.
- any event occurring once in two years.
- Botany. a biennial plant.
Origin of biennial
Examples from the Web for biennially
In some states the legislatures meet annually; in others, biennially.Why We Punctuate
William Livingston Klein
Time of meeting of the legislature, fourth Monday in November, biennially.The South-West
Jonathon Holt Ingraham
This body meets in August, biennially, to revise the jury list.Elements of Civil Government
Alexander L. Peterman
Legislature and State officers elected quadrennially; members Congress, biennially.Alden's Handy Atlas of the World
John B. Alden
Some unions meet annually, some biennially, some triennially, and a few determine by referendum when the convention is to meet.The Armies of Labor
Samuel P. Orth
- occurring every two years
- lasting two yearsCompare biannual
Word Origin and History for biennially
"lasting for two years" (1620s); "occurring every two years" (1750), from Latin biennium "two-year period," from bi- (see bi-) + annus "year" (see annual). The vowel change is "due to the Latin phonetic law according to which the unaccented and closed radical syllable of the second element of compounds, original -ă- becomes -ĕ-" [Klein]. The noun meaning "a biennial plant" is attested by 1770.
- Completing a life cycle normally in two growing seasons.
- A biennial plant. In the first year, biennials normally produce a short stem, a rosette of leaves, and a fleshy root that acts as food supply. In the second season, biennials blossom, produce seed, use up their food supply, and die. Carrots, parsnips, and sugar beets are examples of biennials. Compare annual perennial.