1. be a signal for or a symptom of

    Synonyms : bespeak, betoken, indicate, point
    Type Of : tell
    Examples :
    • The economic indicators signal that the euro is undervalued
  2. any nonverbal action or gesture that encodes a message

    Synonyms : sign, signaling
    Type Of : communication
    Examples :
    • signals from the boat suddenly stopped
  3. communicate silently and non-verbally by signals or signs

    Synonyms : sign, signalise, signalize
    Type Of : intercommunicate, communicate
    Examples :
    • The diner signaled the waiters to bring the menu
  4. an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

    Type Of : electricity, electrical energy, power
  5. any incitement to action

    Type Of : incitement, provocation, incitation
    Examples :
    • he awaited the signal to start
    • the victory was a signal for wild celebration
  6. notably out of the ordinary

    Examples :
    • the year saw one signal triumph for the Labour party