• 1. any sign, gesture, token, etc, that serves to communicate information
• 2. anything that acts as an incitement to action
• 3. a variable parameter, such as a current or electromagnetic wave, by which information is conveyed through an electronic circuit, communications system, etc
• 4. the information so conveyed
• 5. ( as modifier )
• 6. distinguished or conspicuous
• 7. used to give or act as a signal
• 8. to communicate (a message, etc) to (a person)
• 9. C16: from Old French seignal, from Medieval Latin ...

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