1. (

• signal ,
• signaling ,
• sign ,

) any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped" ;

2. (

• signal

) any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration" ;

3. (

• signal

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

1. (

• sign ,
• signal ,
• signalize ,
• signalise ,

) 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" ;

2. (

• bespeak ,
• betoken ,
• indicate ,
• point ,
• signal ,

) 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" ;

1. (

• signal

) notably out of the ordinary; "the year saw one signal triumph for the Labour party" ;