Dictionary![]() ![]() sig•nalPronunciation: (sig'nl), [key] —n., adj., v., -naled, -nal•ingor (esp. Brit.) -nalled, -nal•ling. —n. 1. anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave. 2. anything agreed upon or understood as the occasion for concerted action. 3. an act, event, or the like that causes or incites some action: The unjust execution was the signal for revolt. 4. a token; indication. 5. Electronics.an electrical quantity or effect, as current, voltage, or electromagnetic waves, that can be varied in such a way as to convey information. 6. Cards.a play that reveals to one's partner a wish that he or she continue or discontinue the suit led. —adj. 1. serving as a signal; used in signaling: a signal flag. 2. unusual; notable; outstanding: a signal exploit. —v.t. 1. to make a signal to. 2. to communicate or make known by a signal. —v.i. to make communication by a signal or signals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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