involution in WordNet English dictionary

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