deformation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or process of deforming.
• noun The condition of being deformed.
• noun An alteration of form for the worse.
• noun An alteration of shape, as by pressure or stress.
• noun The shape that results from such an alteration.

from The Century Dictionary.

• noun In botany, any malformation or abnormal growth due to the attack of some parasite.
• noun In geology, the process whereby, under the influence of strains (usually compressive), individual strata, masses of rock, or larger portions of the earth's crust suffer change of form, as when massive rocks become schistose, flat strata are folded, or mountain-ranges are upheaved.
• noun The act of deforming, or changing the form of; change of form.
• noun An altered form.
• noun Deformity; disfigurement.
• noun In geometry and mech., a change of shape of a body or surface without any breach of the continuity of its parts, and generally without any alteration of the size of them; relative displacement of parts; strain.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of deforming, or state of anything deformed.
• noun Transformation; change of shape.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of deforming, or state of being deformed.
• noun A transformation; change of shape.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a change for the worse
• noun alteration in the shape or dimensions of an object as a result of the application of stress to it
• noun the act of twisting or deforming the shape of something (e.g., yourself)