- Physics.
- an array of entities, as light waves or particles, ordered in accordance with the magnitudes of a common physical property, as wavelength or mass: often the band of colors produced when sunlight is passed through a prism, comprising red, orange, yellow, green, blue, indigo, and violet.
- this band or series of colors together with extensions at the ends that are not visible to the eye, but that can be studied by means of photography, heat effects, etc., and that are produced by the dispersion of radiant energy other than ordinary light rays.
- a broad range of varied but related ideas or objects, the individual features of which tend to overlap so as to form a continuous series or sequence: the spectrum of political beliefs.
- the range of traits and behaviors that are considered to be characteristic of autism spectrum disorder.
- having an autism spectrum disorder, or displaying behaviors considered characteristic of those disorders: The nonprofit works to increase public awareness about the day-to-day issues faced by people on the spectrum.
- 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
- 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
