Definition of: coupling

(kup′ling) noun
1. The act of joining together; specifically, the act of joining in marriage or copulation.
2. A coupler, or that which couples: a car or carriage coupling.
3. The length between the tops of the shoulder blades and the tops of the hip joints in a dog.
4. The part of the body joining the hindquarters of a quadruped to the front part, as in a dog or a horse. See illustrations under DOG, HORSE.
5. Mech. A friction or jaw clutch to connect moving parts or break the connection.
6. Electr. A connection between two circuits permitting transfer of power from one to the other.