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the distribution of colours produced when white light is dispersed by a prism or diffraction grating. There is a continuous change in wavelength from red, the longest wavelength, to violet, the shortest. Seven colours are usually distinguished: violet, indigo, blue, green, yellow, orange, and red

the whole range of electromagnetic radiation with respect to its wavelength or frequency

any particular distribution of electromagnetic radiation often showing lines or bands characteristic of the substance emitting the radiation or absorbing it See also absorption spectrum emission spectrum

any similar distribution or record of the energies, velocities, masses, etc, of atoms, ions, electrons, etc

any range or scale, as of capabilities, emotions, or moods

another name for an afterimage

A range over which some measurable property of a physical phenomenon, such as the frequency of sound or electromagnetic radiation, or the mass of specific kinds of particles, can vary. For example, the spectrum of visible light is the range of electromagnetic radiation with frequencies between between 4.7 × 10 ¹⁴ and 7.5 × 10 ¹⁴ hertz.

The observed distribution of a phenomenon across a range of measurement.

See more at atomic spectrum spectroscopy