1.  coupling(n = noun.artifact) yoke - a connection (like a clamp or vise) between two things so they move together;
Derived form verb couple₁

2.  coupling(n = noun.artifact) coupler - a mechanical device that serves to connect the ends of adjacent objects;
Derived form verb couple₂

3.  coupling(n = noun.act) conjugation, mating, pairing, sexual union, union - 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"
Derived form verb couple₄

1.  The act of bringing or coming together; connection; sexual union. [1913 Webster]

2.  A device or contrivance which serves to couple or connect adjacent parts or objects; as, a belt coupling, which connects the ends of a belt; a car coupling, which connects the cars in a train; a shaft coupling, which connects the ends of shafts. [1913 Webster]

coupling, n.
1 a a link connecting railway carriages etc. b a device for connecting parts of machinery.
2 Physics a connection between two systems, causing one to oscillate when the other does so.
3 Mus. a the arrangement of items on a gramophone record. b each such item.