Origin: Latin suffix -al
Biennial has 5 different meanings across 2 categories:
(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
"The gardener carefully transplanted the newly sprouted carrot seedlings into warmer soil, knowing they would need another full winter before blooming as true biennial plants."
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
"The gardener carefully waited until the biennial poppy finished blooming before pulling up the spent stalks from the garden bed."
Happening every two years.
"The local flower festival is a biennial event that draws crowds from all over the region every other spring."