from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The green-colored light that signals traffic to proceed.
  • noun Informal Permission to proceed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A traffic light in its green state (indicating that vehicles may proceed).
  • noun idiomatic approval, or permission to proceed.

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

  • noun permission to proceed with a project or to take action
  • noun a signal to proceed


from Wiktionary, Creative Commons Attribution/Share-Alike License

From the standard red-green color scheme used in traffic lights and railway signals.


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