"involution" in the noun sense
reduction in size of an organ or part (as in the return of the uterus to normal size after childbirth)
a long and intricate and complicated grammatical construction
3. elaborateness, elaboration, intricacy, involution
marked by elaborately complex detail
4. engagement, participation, involvement, involution
the act of sharing in the activities of a group
"the teacher tried to increase his students' engagement in class activities"
5. exponentiation, involution
the process of raising a quantity to some assigned power
6. involution, enfolding
the action of enfolding something
Source: WordNet® (An amazing lexical database of English)
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