Per‐en″ni‐al (pĕr‐ĕn″nĭ‐al), a. [L. perennis that lasts the whole year through; per through + annus year. See Per-, and Annual.] 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. Burke.
3. (Bot.) Continuing more than two years; as, a perennial steam, or root, or plant.
Syn. — Perpetual; unceasing; never failing; enduring; continual; permanent; uninterrupted.