Webster's English Dictionary

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coupling

cou.pling \'k*p-lin (usual for 2), -*-lin\ n 1: the act of bringing or 
   coming together : PAIRING; specif :: sexual union 2: a device that serves 
   to connect the ends of adjacent parts or objects  3: the joining of or the 
   part of the body that joins the hindquarters to th e forequarters of a 
   quadruped 4: means of electric connection of two electric circuits by 
   having a part c ommon to both