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Definition of primary colour noun from the Oxford Advanced Learner's Dictionary

primary colour

noun
 
/ˌpraɪməri ˈkʌlə(r)/
 
/ˌpraɪmeri ˈkʌlər/
(US English primary color)
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  1. one of the three colours, red, yellow and blue, that can be mixed together to make all other colours
previously
adverb
 
 
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