Distortion

n. deformity, twisting out of shape; falsification, misrepresentation

A distortion is the alteration of the original shape (or other characteristic) of an object, image, sound, waveform or other form of information or representation. Distortion is usually unwanted. In some fields, distortion is desirable, such as electric guitar (where distortion is often induced purposely with the amplifier to achieve the electric guitar's desired, electrifying, aggressive sound). The slight distortion of analog tapes and vacuum tubes is considered pleasing in certain situations. The addition of noise or other extraneous signals (hum, interference) is not considered to be distortion, though the effects of distortion are sometimes considered noise.
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Distortion /dis·tor·tion/ 1. the state of being twisted out of normal shape or position. 2. in psychiatry, the conversion of material offensive to [more]Distortion - Community and Resources

Noun
1. a change for the worse
(synonym) deformation
(hypernym) damage, harm, impairment
(hyponym) warp, warping
2. a shape resulting from distortion
(synonym) distorted shape
(hypernym) shape, form
(hyponym) tortuosity, tortuousness, torsion, contortion, crookedness
(derivation) twist, twine, distort
3. an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
(synonym) aberration, optical aberration
(hypernym) optical phenomenon
(hyponym) chromatic aberration
4. a change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal); "heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion"
(hypernym) electrical phenomenon
(hyponym) nonlinear distortion, amplitude distortion
(derivation) falsify, distort, garble, warp
5. the act of distorting something so it seems to mean something it was not intended to mean
(synonym) overrefinement, straining, torture, twisting
(hypernym) falsification, misrepresentaation
(derivation) falsify, distort, garble, warp
6. the mistake of misrepresenting the facts
(hypernym) mistake, error, fault
(derivation) falsify, distort, garble, warp

(n.)
The state of being distorted, or twisted out of shape or out of true position; crookedness; perversion.
  

(n.)
The act of distorting, or twisting out of natural or regular shape; a twisting or writhing motion; as, the distortions of the face or body.
  

(n.)
An unnatural deviation of shape or position of any part of the body producing visible deformity.
  

(n.)
A wresting from the true meaning.