(1):
(a.) Continuing more than two years; as, a perennial steam, or root, or plant.
(2):
(n.) A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not.
(3):
(a.) Continuing without cessation or intermission; perpetual; unceasing; never failing.
(4):
(a.) ing or continuing through the year; as, perennial fountains.