1.Definition: an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

Category: General

2.Definition: any incitement to action

"He awaited the signal to start", "The victory was a signal for wild celebration"

Category: General

3.Definition: any nonverbal action or gesture that encodes a message

"Signals from the boat suddenly stopped"

Related Noun(s):sign

Category: General