Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Present participle of signal.
  • n. The sending of a biochemical signal

from The Century Dictionary and Cyclopedia

  • n. The use of signals; in railroading, the business of controlling the traffic by means of signals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any nonverbal action or gesture that encodes a message

Etymologies

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