[n] any communication that encodes a message; "signals from the boat suddenly stopped"
[n] any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration"
[n] an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
[adj] notably out of the ordinary; "the year saw one signal triumph for the Labour party"
[v] be a signal for or a symptom of; "These symptoms indicate a serious illness"; "Her behavior points to a severe neurosis"; "The economic indicators signal that the euro is undervalued"
[v] 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"