What is the meaning of relays?

noun

• The act of passing something along from one person or group to another.
  • usage: "the relay was successful"
  • synonyms: relay
• A crew of workers who relieve another crew.
  • synonyms: relay
• A fresh team to relieve weary draft animals.
  • synonyms: relay
• A race between teams; each member runs or swims part of the distance.
  • synonyms: relay, relay race
• Electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit.
  • synonyms: relay, electrical relay

verb

• Pass along.
  • usage: "Please relay the news to the villagers"
  • synonyms: relay
• Control or operate by relay.
  • synonyms: relay