involution

noun
in·​vo·​lu·​tion | \ ˌin-və-ˈlü-shən How to pronounce involution (audio) \

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
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 How to pronounce involution (audio) , -​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 The opposite of evolution, a process of involution spirals in on itself, trapping its participants. Yi-ling Liu, Wired, 9 Mar. 2021 Notice that this is an involution as = ∂. In addition, the only self-conjugate itinerary is a string of O’s. Nicholas Diaco, Scientific American, 20 Mar. 2018 The entire process is known as involution of the uterus. Jennifer Hansen, WIRED, 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.

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First Known Use of involution

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

History and Etymology for involution

Middle English involucioun "wrapping of a bandage, twist or coil of an organ, anatomical fold or entanglement," borrowed from Middle French & Medieval Latin; Middle French involucion "state of something rolled up on itself, confusion, complications hindering the prosecution of a lawsuit," borrowed from Medieval Latin involūtiōn-, involūtiō "twist or coil of an organ, covering, wrapping up, envelopment, complexity, obscurity," going back to Latin, "a spiral, screw," from involū-, variant stem of involvere "to move by rolling, roll back on itself, enclose in a covering, wrap up" (Medieval Latin, "to engage in an affair or occupation, implicate, ensnare") + -tiōn-, -tiō, suffix of verbal action — more at involve

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Time Traveler for involution

Time Traveler

The first known use of involution was circa 1611

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Dictionary Entries Near involution

involute tooth

involution

involve

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Last Updated

29 Sep 2021

Cite this Entry

“Involution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/involution. Accessed 17 Oct. 2021.

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More Definitions for involution

involution

noun
in·​vo·​lu·​tion | \ ˌin-və-ˈlü-shən How to pronounce involution (audio) \

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

More from Merriam-Webster on involution

Britannica.com: Encyclopedia article about involution

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