Dictionary.com
definitions
  • synonyms

traffic light

See more synonyms on Thesaurus.com
noun
  1. a set of electrically operated signal lights used to direct or control traffic at intersections.
Show More

Origin of traffic light

First recorded in 1925–30
Also called stoplight, traffic signal, traffic control signal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for traffic light

traffic light

traffic signal

noun
  1. 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
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012