involution

[ in-vuh-loo-shuh n ]
/ ˌɪn vəˈlu ʃən /

noun

Origin of involution

First recorded in 1605–15, involution is from the Medieval Latin word involūtiōn- (stem of involūtiō). See involute, -ion
Related formssu·per·in·vo·lu·tion, noun
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Examples from the Web for involution

British Dictionary definitions for involution

involution

/ (ˌɪnvəˈluːʃən) /

noun

Derived Formsinvolutional, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for involution

involution


n.

late 14c., from Latin involutionem (nominative involutio) "a rolling up," noun of action from past participle stem of involvere (see involve). Related: Involutional.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for involution

involution

[ ĭn′və-lōōshən ]

n.

A decrease in size of an organ, as of the uterus following childbirth.
The ingrowth and curling inward of a group of cells, as in the formation of a gastrula from a blastula.
A progressive decline or degeneration of normal physiological functioning occurring as a result of the aging process.catagenesis
Related formsin′vo•lution•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for involution

involution

[ ĭn′və-lōōshən ]

A mathematical operation, such as negation, which, when applied to itself, returns the original number.
The ingrowth and curling inward of a group of cells, as in the formation of a gastrula from a blastula.
A decrease in size of an organ, as of the uterus following childbirth.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.