The Chinese word 彩色 (cǎisè), meaning "colorful" or "in color," is a compound noun formed through **coordinate compounding**, where two semantically related characters are combined. The first character, 彩 (cǎi), carries the meaning of "color" but with a connotation of variety, brilliance, or decoration (as in 五彩, "multicolored"). The second character, 色 (sè), is the fundamental word for "color" or "hue." When placed together, they create a **synergistic and slightly emphatic compound** where 彩 modifies and enriches 色, resulting in a term that specifically denotes the presence of multiple colors or the quality of being chromatic, as opposed to monochrome.