Webster's English Dictionary

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friction

fric.tion \'frik-sh*n\ \-l*s\ n [MF or L; MF, fr. L friction-, frictio, fr. 
   frictus, pp. of (Xfricare to rub; akin to L friare to crumble, Skt 
   bhri-nc~anti they injure 1a: the rubbing of one body against another  1b: 
   resistance to relative motion between two bodies in contact  2: the 
   clashing between two persons or parties of opposed views : DISA GREEMENT - 
   fric.tion.less aj