Lasting or continuing without cessation through the year, or through many years: as, a perennial spring or fountain.Continuing without stop or intermission; perpetual; unceasing; never-failing; everlasting.In zoology, growing continually: noting teeth which have the pulp-cavity open, and grow indefinitely from persistent pulps: as, the perennial incisors of a rodent.In botany, continuing more than two years: as, a perennial stem or root.In entomology, forming colonies which are continued from year to year, as the ants, bees, and termites; also, living more than one year, as an insect.n. In botany, a plant which lives and blossoms or fructifies year after year.