Webster's English Dictionary

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distortion

dis.tor.tion \dis-'to.r-sh*n\ \-shn*l, -sh*n-*l\ n 1: the act of distorting 
    2: the quality or state of being distorted or a product of distortion : as 
    2a: a lack of proportionality in an image resulting from defects in the 
   opt ical system 2b: falsified reproduction caused by change in wave form of 
   a signal  - dis.tor.tion.al aj