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The definition of signal

6 Definitions of: signal

1. noun, any sign, gesture, token, etc, that serves to communicate information
2. noun, anything that acts as an incitement to action
3. noun, 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)
4. adjective, distinguished or conspicuous
5. adjective, used to give or act as a signal
6. verb, to communicate (a message, etc) to (a person)
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1. noun, one of a set of coloured lights placed at crossroads, junctions, etc, to control the flow of traffic. A red light indicates that traffic must stop and a green light that it may go: usually an amber warning light is added between the red and the green
2. Show me some examples of this word: signal
3. Show me the etymology of the word: signal

Synonyms:	expression, note, evidence, rocket, flare, beam, beacon, cue, sign, nod	And more...

From Collins