color noun (APPEARANCE). âº [C/U] the âappearance that something has as a âresult of âreflecting âlight: [C] The âdress comes in âblue, âgreen, âred, and other colors. [U] Some of the âpictures in the âbook are in color, and some are in âblack and âwhite. âº art [C/U] A color is also a âsubstance, such as a âpaint or dye, which you âadd to something to make it have the âappearance of a âparticular color.