Definition of color code noun from the Oxford Advanced American Dictionary

 

color code

 noun
(colour code)noun
 
 
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a system of marking things with different colors so that you can easily identify them Follow the color code carefully on all electrical wiring.
color-coded(colour-coded)
 
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adjective The files have labels that are color-coded according to subject.
See the Oxford Advanced Learner's Dictionary entry: color code