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A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
Related to perennial: perennial ryegrass, Perennial philosophy. (pÉ-rÄnâ²Ä-Él) adj. 1. a. Lasting an indefinitely long time; enduring: an author's perennial popularity among children. b. Appearing again and again or year after year; recurrent: a perennial contender for the championship. See Synonyms at continual.