1. • noun - any nonverbal action or gesture that encodes a message
   • noun - any incitement to action
   • noun - 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
   • verb - be a signal for or a symptom of
   • adj - notably out of the ordinary
2. • An indicator, such as a gesture or colored light, that serves as a means of communication.
   • A message communicated by such means.
   • Something that incites action: The peace treaty was the signal for mass celebrations.
   • An impulse or a fluctuating electric quantity, such as voltage, current, or electric field strength, whose variations represent coded information.
   • Notably out of the ordinary: a signal feat.
   • To make a signal to: I signaled the driver to proceed.
   • To make a signal or signals.
3. • v - to notify by a means of communication

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