Perennial /(pĕr*ĕn"nĭ*al)/

Per·en·ni·al

Perennial

a.
  1. Lasting or continuing through the year; as, perennial fountains.
  2. Continuing without cessation or intermission; perpetual; unceasing; never failing.
    The perennial existence of bodies corporate.
  3. Continuing more than two years; as, a perennial steam, or root, or plant. (Bot.)

Perennial

n.
  1. A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not. (Bot.)