Lasting or continuing without cessation through the year.

Perpetual; unceasing; never failing.

In botany, continuing more than two years; as a perennial stem or root.

Continuing without intermission; as a fever.£

In botany, a plant which lives or continues more than two years, whether it retains its leaves or not. That which retains its leaves during winter is called an evergreen; that which casts its leaves, deciduous, or a perdifoil.