The quality of a color as determined by its dominant wavelength WordNet 3.0 & Open English WordNet

Chromaticity is an objective specification of the quality of a color regardless of its luminance. Wikipedia

In color theory, hue is one of the main properties of a color, defined technically in the CIECAM02 model as "the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, orange, yellow, green, blue, violet," within certain theories of color vision. Wikipedia

The quality of a color as determined by its "purity" and dominant wavelength Wikipedia Disambiguation

Gradation of color. Wikipedia Disambiguation

Objective specification of the quality of a color regardless of its luminance. A combination of hue and saturation. Wikidata

A pure color - one without added white or black. OmegaWiki

An objective specification of the quality of a colour, regardless of its luminance. Wiktionary

Specification of the quality of a colour, regardless of its luminance. Wiktionary (translation)

The characteristic related to the light frequency that appears in the color, for instance red, yellow, green, cyan, blue or magenta. Wiktionary

The characteristic related to the light frequency that appears in the color. Wiktionary (translation)