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Definitions of signal
  1. verb
    be a signal for or a symptom of
    "The economic indicators signal that the euro is undervalued"
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  2. noun
    any nonverbal action or gesture that encodes a message
    "signals from the boat suddenly stopped"

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  3. verb
    communicate silently and non-verbally by signals or signs
    "The diner signaled the waiters to bring the menu"

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  4. noun
    an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
  5. noun
    any incitement to action
    "he awaited the signal to start" "the victory was a signal for wild celebration"
  6. adjective
    notably out of the ordinary
    "the year saw one signal triumph for the Labour party"

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Explanation of signal
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