Webster's English Dictionary

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intercourse

in.ter.course \'int-*r-.ko-(*)rs, -.ko.(*)rs\ n [ME intercurse, prob. fr. 
   MF entercours, fr. ML intercursus,]fr. L, act of running between, fr. 
   intercursus, pp. of intercurrere to run between, fr. inter- + currere to 
   run - more at CURRENT 1: connection between persons or groups : 
   COMMUNICATION  2: COPULATION, COITUS