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  • adjective
    of a plant :living for several years or for many years :having a life cycle that is more than two years long
    a perennial plant
    This variety of oregano is perennial. - compare 1annual, 1biennial
    existing or continuing in the same way for a long time
    happening again and again
    Flooding is a perennial problem for people living by the river.
    noun
    plural -als
    [count] :a plant that lives for several years or for many years :a perennial plant