Webster's English Dictionary

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repugnance

re.pug.nance also re.pug.nan.cy \ri-'p*g-n*n(t)s\ \-n*n-se-\ n 1a: the 
   quality or fact of being opposed and esp. reciprocally opposed  1b: an 
   instance of such opposition  2: strong dislike, distaste, or antagonism