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Perennial Per*en"ni*al, a. [L. perennis that lasts the whole year through; per through + annus year. See Per-, and Annual.] 1. ing 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., Perennial Per*en"ni*al, n. (Bot.) A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not.