Cou'pling, n.

n. 1. The act of bringing or coming together; connection; sexual union. 2. (Mach.) That which serves to couple or connect, as a hook, chain, or other contrivance; as, the coupling of railroad cars; any contrivance for connecting shafts end to end, either permanently, or so as to admit of their being joined or disjoined at pleasure, as by a box, clutch, heads with interlocking teeth, &c.