n Two partners in a romantic or sexual relationship.
n Two of the same kind connected or considered together.
n (informal) A small number.
n One of the pairs of plates of two metals which compose a voltaic battery, called a voltaic couple or galvanic couple.
n (physics) Two forces that are equal in magnitude but opposite in direction (and acting along parallel lines), thus creating the turning effect of a torque or moment.
v (transitive) To join (two things) together, or (one thing) to (another).
v (transitive|dated) To join in wedlock; to marry.
v (intransitive) To join in sexual intercourse; to copulate.