Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength. Completely monochromatic radiation cannot be produced, but lasers produce radiation within a very narrow frequency band. Comparepolychromatic radiation.
Electronics and Electrical Engineering
Electromagnetic radiation of a single frequency (or, equivalently, of a single wavelength). In practice radiation of a single frequency is never achieved and the term is applied to a narrow range of frequencies. The term is also applied to particulate radiation when the particles are all of the same type and energy but in this case the description homogeneous or monoenergetic is usually preferred. Comparepolychromatic radiation.