American Heritage® Dictionary of the English Language, Fourth Edition
- n. A color belonging to any of three groups each of which is regarded as generating all colors, with the groups being:
- n. Additive, physiological, or light primaries red, green, and blue. Lights of red, green, and blue wavelengths may be mixed to produce all colors.
- n. Subtractive or colorant primaries magenta, yellow, and cyan. Substances that reflect light of one of these wavelengths and absorb other wavelengths may be mixed to produce all colors.
- n. Psychological primaries red, yellow, green, and blue, plus the achromatic pair black and white. All colors may be subjectively conceived as mixtures of these. See Table at color.
- n. alternative spelling of primary colour.
- n. any of three colors from which all others can be obtained by mixing
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