perennial

(noun) (botany) a plant lasting for three seasons or more.

(adj) lasting three seasons or more. Synonyms: perennial (vs. annual) (vs. biennial). Example: "The common buttercup is a popular perennial plant."

(adj) lasting an indefinitely long time; suggesting self-renewal. Example: "Perennial happiness."

(adj) recurring again and again. Synonyms: recurrent, repeated. Example: "Perennial efforts to stipulate the requirements."