Traffic Light Definition

noun
A mechanical device consisting of a set of signal lights operating in sequence (usually green to yellow to red and back to green), placed at intersections to regulate traffic.
Webster's New World

A signalling device positioned at a road intersection or pedestrian crossing to indicate when it may be safe to drive, ride or walk, using a universal colour code.

Wiktionary

(philately) The coloured dots on stamp sheet margins printed with offset litho or photogravure methods, used by the printers to check colour accuracy.

Wiktionary
Alternative spelling of traffic light.
Wiktionary
Synonyms:

Other Word Forms of Traffic Light

Noun

Singular:
traffic light

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traffic light