- signal
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/sig"nl/, n., adj., v., signaled, signaling or (esp. Brit.) signalled, signalling.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.7. serving as a signal; used in signaling: a signal flag.8. unusual; notable; outstanding: a signal exploit.v.t.9. to make a signal to.10. to communicate or make known by a signal.v.i.11. to make communication by a signal or signals.[1350-1400; ME (n.) < ML signale, LL, n. use of neut. of signalis of a sign. See SIGN, -AL2, -AL1]Syn. 1, 4. sign. 8. unique, exceptional, remarkable, striking.
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Universalium. 2010.