from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The green-colored light that signals traffic to proceed.
- n. Informal Permission to proceed.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A traffic light in its green state (indicating that vehicles may proceed).
- n. approval, or permission to proceed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. permission to proceed with a project or to take action
- n. a signal to proceed
From the standard red-green color scheme used in traffic lights and railway signals. (Wiktionary)