Meaning of signal
Definition of signal
(noun)
any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration"
an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
(verb)
communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"