Colour (Commonwealth English) or color (American English)  is a property of light as seen by people. In Commonwealth English, it is spelled “colour” (notice the U), while in American English it is “color” (no U).
The most common colour names are:
- Gray (American English)
- Grey (Commonwealth English)
- Navy blue
"Primary colours" can be mixed to make other colours. Red, yellow, and blue are the three traditional primary colours. The primary colours for television screens and computer monitors are red, green and blue. Printers and paints use magenta, yellow, and cyan as their primary colours; they may also use black. Sometimes this set of colours is simply called red, yellow, and blue.
When something has no colour, it is transparent. An example is air.
The science of color is sometimes called chromatics, colorimetry, or simply color science.
|The Simple English Wiktionary has a definition for: colour.|