involution
     n 1: reduction in size of an organ or part (as in the return of
          the uterus to normal size after childbirth)
     2: a long and intricate and complicated grammatical
        construction
     3: marked by elaborately complex detail [syn: {elaborateness},
        {elaboration}, {intricacy}]
     4: the act of sharing in the activities of a group; "the
        teacher tried to increase his students' engagement in
        class activities" [syn: {engagement}, {participation}, {involvement}]
        [ant: {non-engagement}, {non-engagement}, {non-engagement}]
     5: the process of raising a quantity to some assigned power
        [syn: {exponentiation}]
     6: the action of enfolding something [syn: {enfolding}]
Source: WordNet® 2.0