coupling
     n 1: a connection (like a clamp or vise) between two things so
          they move together [syn: {yoke}]
     2: a mechanical device that serves to connect the ends of
        adjacent objects [syn: {coupler}]
     3: the act of pairing a male and female for reproductive
        purposes; "the casual couplings of adolescents"; "the
        mating of some species occurs only in the spring" [syn: {mating},
         {pairing}, {conjugation}, {union}, {sexual union}]
Source: WordNet® 2.0