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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.
Wiktionary (0.00 / 0 votes) Rate this definition: perennial (Noun). A perennial plant; a plant that is active throughout the year or survives for more than two growing seasons. Compare annual, biennial. perennial (Adjective). Lasting or remaining active throughout the year, or all the time.a perennial stream. perennial (Adjective). Having a life cycle of more than two years.iktionary (0.00 / 0 votes) Rate this definition: perennial (Noun). A perennial plant; a plant that is active throughout the year or survives for more than two growing seasons. Compare annual, biennial. perennial (Adjective). Lasting or remaining active throughout the year, or all the time.