Having or consisting of one color or hue. The artist's monochromatic painting featured various shades of blue.
Lacking variety or interest; dull or monotonous. The monochromatic decor of the office made it feel uninspiring.
(Physics, Optics) Of light or other electromagnetic radiation: having a single wavelength or a very narrow band of wavelengths. The researchers used a monochromatic laser to measure the sample’s fluorescence.