involution

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noun in·vo·lu·tion \ ˌin-və-ˈlü-shən \

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
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

involutional

play \ˌin-və-ˈlü-shnəl, -shə-nᵊl\ adjective

Examples of involution in a Sentence

  1. the involution of the thriller's plot made it hard to follow

Recent Examples of involution from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'involution.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of involution

Latin involution-, involutio, from involvere


Medical Dictionary

involution

play
noun in·vo·lu·tion \ ˌin-və-ˈlü-shən \

medical Definition of involution

1 a :an inward curvature or penetration
b :the formation of a gastrula by ingrowth of cells formed at the dorsal lip
2 :a shrinking or return to a former size
  • involution of the uterus after pregnancy
3 :the regressive alterations of a body or its parts characteristic of the aging process; specifically :decline marked by a decrease of bodily vigor and in women by menopause


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