biennial

(noun) (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.

(adj) having a life cycle lasting two seasons. Synonyms: biennial (vs. perennial) (vs. annual), two-year. Examples: "A biennial life cycle." "Parsnips and carrots are biennial plants often grown as annuals."

(adj) occurring every second year. Synonyms: biyearly. Example: "They met at biennial conventions."