Which term describes light that contains multiple wavelengths?

The term that describes light containing multiple wavelengths is polychromatic. This refers to light that is made up of a range of different colors and wavelengths, much like white light, which consists of a combination of all the colors in the visible spectrum. Polychromatic sources, such as sunlight or fluorescent lamps, emit light over a wide range of wavelengths, which allows us to perceive various colors.

In contrast, the term monochromatic signifies light that consists of a single wavelength, resulting in only one color being produced, which is not the focus of this question. Unicolored is a less common term and does not carry a specific technical meaning in optics, while varioluminal is not recognized as a standard term in the context of light wavelengths. Therefore, polychromatic is the only accurate term that describes light that contains multiple different wavelengths.