coupling

coupling [ kúppling ] (plural couplings)

noun

Definition:

1. something that joins two things: something that joins two things, especially a device for connecting two pieces of pipe, hose, or tube

2. joining two things together: a joining together or linking of two persons or things

a disastrous coupling of two very different singers

3. sex act: an act of sexual intercourse

4. mechanical engineering link that transfers power: a part of a mechanical system by which power is transmitted from one rotating part to another part

5. UK rail connector for railway carriages: a device on railway carriages that is used to link them in a train.

US term  coupler

6. zoology trunk of animal’s body: the part of the body of a four-legged animal between the forequarters and hindquarters

7. electricity connection of electrical circuits: a means of connecting two electrical circuits so that power can be passed between them, or the process of connecting electrical circuits in this way