Perennial refers to a plant that continues to grow even after it has reproduced. Perennial plants usually last more than two seasons. In geography, the word is usually used to refer to a river that flows all the year through.
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what does perennial mean
lasting for an indefinitely long time; enduring: her perennial beauty.
(of plants) having a life cycle lasting more than two years.
lasting or continuing throughout the entire year, as a stream.
perpetual; everlasting; continuing; recurrent.
a perennial plant: Daffodils and tulips are perennials.