involution

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

Definition of involution 

1a(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

3a : 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

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Other words from involution

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

Examples of involution in a Sentence

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

Recent Examples on the Web

Notice that this is an involution as = ∂. In addition, the only self-conjugate itinerary is a string of O’s. Nicholas Diaco, Scientific American, "Privacy and Counterfeit Coins," 20 Mar. 2018 The entire process is known as involution of the uterus. Jennifer Hansen, WIRED, "My Incredible Shrinking Uterus," 6 Oct. 2010

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.

First Known Use of involution

circa 1611, in the meaning defined at sense 1a(1)

History and Etymology for involution

Latin involution-, involutio, from involvere

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Last Updated

21 Aug 2018

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Time Traveler for involution

The first known use of involution was circa 1611

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More Definitions for involution

involution

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

Medical Definition of involution 

1a : 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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occurring twice a year or every two years

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