Definition of color:
(n) :
the spectral composition of visible light; a particular set of visible spectral compositions, perceived or named as a class
"humans and birds can perceive color."
(adj) :
conveying color, as opposed to shades of gray
"color television and movies were considered a great improvement over black and white."
(v) :
to give something color; to draw within the boundaries of a line drawing using colored markers or crayons
"we could color the walls red."