- any of three spectral colours (usually red, green, and blue) that can be mixed to match any other colour, including white light but excluding black
- any one of the spectral colours cyan, magenta, or yellow that can be subtracted from white light to match any other colour. An equal mixture of the three produces a black pigment
- any one of the colours red, yellow, green, or blue. All other colours look like a mixture of two or more of these colours and they play a unique role in the processing of colour by the visual system
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