distortion noun 1 : the act of twisting or altering something out of its true, natural, or original state : the act of distorting a distortion of the facts 2 : the quality or state of being distorted : a product of distorting: such as a physics : a lack of proportionality in an image resulting from defects in the optical system an image free of distortion b : falsified reproduction of an audio or video signal caused by change in the wave form of the original signal Heavens Digital