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sig·nal  (sgnl)
a. An indicator, such as a gesture or colored light, that serves as a means of communication. See Synonyms at gesture.
b. A message communicated by such means.
2. Something that incites action: The peace treaty was the signal for celebration.
3. Electronics An impulse or a fluctuating electric quantity, such as voltage, current, or electric field strength, whose variations represent coded information.
4. The sound, image, or message transmitted or received in telegraphy, telephony, radio, television, or radar.
Notably out of the ordinary: a signal feat; a signal event.
v. sig·naled or sig·nalled, sig·nal·ing or sig·nal·ling, sig·nals
1. To make a signal to: I signaled the driver to proceed.
2. To relate or make known by signals: They have signaled their willingness to negotiate.
To make a signal or signals.

[Middle English, from Old French, from Medieval Latin signle, from neuter of Late Latin signlis, of a sign, from Latin signum, sign; see sign.]

signal·er, signal·ler n.

signal [ˈsɪgnəl]
1. any sign, gesture, token, etc., that serves to communicate information
2. anything that acts as an incitement to action the rise in prices was a signal for rebellion
3. (Electronics & Computer Science / Telecommunications)
a.  a variable parameter, such as a current or electromagnetic wave, by which information is conveyed through an electronic circuit, communications system, etc.
b.  the information so conveyed
c.  (as modifier) signal strength a signal generator
1. distinguished or conspicuous
2. used to give or act as a signal
vb -nals, -nalling, -nalled US, -nals -naling, -naled
to communicate (a message, etc.) to (a person)
[from Old French seignal, from Medieval Latin signāle, from Latin signum sign]
signaller  US, signaler n

signal  (sgnl)
A fluctuating quantity or impulse whose variations represent information. The amplitude or frequency of voltage, current, electric field strength, light, and sound can be varied as signals representing information.

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