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Definition of BROADBAND
: operating at, responsive to, or comprising a wide band of frequencies <a broadband radio antenna>
: of, relating to, or being a high-speed communications network and especially one in which a frequency range is divided into multiple independent channels for simultaneous transmission of signals (as voice, data, or video)
Term describing the radiation from a source that produces a broad, continuous spectrum of frequencies (contrasted with a laser, which produces a single frequency or very narrow range of frequencies). A typical broadband-light source that can be used for either emission or absorption spectroscopy is a metal filament heated to a high temperature, such as a tungsten lightbulb. Sunlight is also broadband radiation. See alsobroadband technology.