Definition of involution
1 a (1)
: the act or an instance of enfolding or entangling : involvement
(2)
: an involved grammatical construction usually characterized by the insertion of clauses between the subject and predicate
b
: complexity, intricacy
2
: exponentiation
3 a
: an inward curvature or penetration
b
: the formation of a gastrula by ingrowth of cells formed at the dorsal lip
4
: a shrinking or return to a former size
5
: the regressive alterations of a body or its parts characteristic of the aging process
- skeletal involution due to loss of estrogens at menopause
