[dee-fawr-mey-shuh n, def-er-]
See more synonyms for deformation on
  1. the act of deforming; distortion; disfigurement.
  2. the result of deforming; change of form, especially for the worse.
  3. an altered form.
  4. Geology, Mechanics. a change in the shape or dimensions of a body, resulting from stress; strain.

Origin of deformation

1400–50; late Middle English deformacioun < Latin dēfōrmātiōn- (stem of dēfōrmātiō), equivalent to dēfōrmāt(us) (past participle of dēfōrmāre; see deform1) + -iōn- -ion
Related formsde·for·ma·tion·al, adjectivenon·de·for·ma·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for deformation


  1. the act of deforming; distortion
  2. the result of deforming; a change in form, esp for the worse
  3. a change in the dimensions of an object resulting from a stress
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 deformation

mid-15c., "transformation," from Old French deformation and directly from Latin deformationem (nominative deformatio), noun of action from past participle stem of deformare (see deform).

Online Etymology Dictionary, © 2010 Douglas Harper

deformation in Medicine


[dē′fôr-māshən, dĕf′ər-]
  1. An alteration in shape or structure of a previously normally formed part.
  2. A deformity.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.