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    involution
    /ɪnvəˈl(j)uːʃ(ə)n/

    noun

    • 1. the shrinkage of an organ in old age or when inactive, e.g. of the uterus after childbirth.
    • 2. a function, transformation, or operator that is equal to its inverse, i.e. which gives the identity when applied to itself.

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