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Definitions of signal:

noun:   any communication that encodes a message
Example: "Signals from the boat suddenly stopped"

noun:   any incitement to action
Example: "He awaited the signal to start"

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
Example: "The diner signaled the waiters to bring the menu"

verb:   be a signal for or a symptom of
Example: "The economic indicators signal that the euro is undervalued"

adjective:   notably out of the ordinary
Example: "The year saw one signal triumph for the Labour party"

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Alternative Terms
signal-level communications-system signalling power intensity-game voltage-7 decibel federal-standard037c white-level echo-box attenuate recognition-differential bridging-amplifier digital-speech-interpolation line-level differential-gain-control voltage-gain-electronics audio-amplifier-2 dynamic-noise-suppressor dynamic-range reference-level fiber-optics

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