(hunting, rare) A new set of hounds.
(now chiefly historical) A new set of horses kept along a specific route so that they can replace animals that are tired.
(by extension) A new set of anything.
A series of vehicles travelling in sequence.
(athletics) A track and field discipline where runners take turns in carrying a baton from start to finish. The most common events are 4×100 meter and 4×400 meter competitions.
(electronics) An electrical actuator that allows a relatively small electrical voltage or current to control a larger voltage or current.
(transitive) To pass on or transfer (information).
(transitive, now rare) To place (people or horses) in relays, such that one can take over from another.
(intransitive, now rare) To take on a new relay of horses; to change horses.
Alternative spelling of re-lay