[dee-fawr-mey-shuhn, def-er-]
the act of deforming; distortion; disfigurement.
the result of deforming; change of form, especially for the worse.
an altered form.
Geology, Mechanics. a change in the shape or dimensions of a body, resulting from stress; strain.

1400–50; late Middle English deformacioun < Latin dēfōrmātiōn- (stem of dēfōrmātiō), equivalent to dēfōrmāt(us) (past participle of dēfōrmāre; see deform1) + -iōn- -ion

deformational, adjective
nondeformation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deformation (ˌdiːfɔːˈmeɪʃən)
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 10th Edition
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Word Origin & History

mid-15c., from L. deformationem, noun of action from deformare (see deform).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deformation de·for·ma·tion (dē'fôr-mā'shən, děf'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.
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Example sentences
His team's computer models are based on the idea that the floor of the basin
  was pre-stressed by years of crustal deformation.
Paradoxically, its surface appears to be shaped by the deformation of the crust
  and by volcanic activity.
Most solids, if pulled or twisted, will give a little in a process known as
  elastic deformation.
If journalists suffer from a professional deformation it is to accentuate the
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