relay

An act of passing something along from one person, group, or station to another.

A relay race.

A division of a relay race.

A device that responds to a small current or voltage change by activating switches or other devices in an electric circuit.

A crew of workers who relieve another crew; a shift.

A fresh team, as of horses or dogs, to relieve weary animals in a hunt, task, or journey.

To pass along by or as if by relay.

To supply with fresh relays.

To control or retransmit by means of a relay.