involution

involution
noun

[mass noun](Physiology)the shrinkage of an organ in old age or when inactive, e.g. of the womb after childbirth
(生理)（年老或器官不用时，如产后子宫）复旧，衰退，退化
(Mathematics)a function, transformation, or operator that is equal to its inverse, i.e. which gives the identity when applied to itself
(数)对合
[mass noun](formal)the process of involving or complicating, or the state of being involved or complicated
(正式)卷入；纠缠；错综复杂；纠缠不清
periods of artistic involution.
艺术错综复杂时期。

派生
involutional
adjective
语源

late Middle English (in the sense ('part) curling inwards'): from Latin involutio(n-), from involvere (see involve)

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