electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit, a fresh team to relieve weary draft animals, A number of men who relieve others in carrying on some work, verb_ control or operate by relay, pass along, transitive verb_ To pass along by or as if by relay, To supply with fresh relays, To lay again; to lay a second time, adjective_ (Mach.) Relating to, or having the characteristics of, an auxiliary apparatus put into action by a feeble force but itself capable of exerting greater force, used to control a comparatively powerful machine or appliance