Perennial

1. adjective

   lasting an indefinitely long time; suggesting self-renewal

   “perennial happiness”

2. noun

   (botany) a plant lasting for three seasons or more

3. adjective

   lasting three seasons or more

   “the common buttercup is a popular perennial plant”

4. adjective

   recurring again and again

   “perennial efforts to stipulate the requirements”

   Similar: recurrent, repeated