involution
/ˌɪnvəˈljuːʃən/noun
1
- mass noun Physiology the shrinkage of an organ in old age or when inactive, e.g. of the womb after childbirth【生理】（年老或长期不用时, 如生育期后的子宫）复旧, 衰退, 退化。
2
- 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。
3
- 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。
派生词
involutional
adjective词源
late Middle English （in the sense '(part) curling inwards'）： from Latin involutio（n-）， from involvere （see INVOLVE）.