<p><strong>Noun</strong></p><ul><li>An array of entities, as light waves or particles, ordered in accordance with the magnitudes of a common physical property, such as wavelength or mass.</li><li>Often refers to the band of colors produced when sunlight is passed through a prism, comprising red, orange, yellow, green, blue, indigo, and violet.</li><li>This band or series of colors, along with extensions at the ends that are not visible to the eye but can be studied by means of photography, heat effects, etc., produced by the dispersion of radiant energy other than ordinary light rays.</li><li>A broad range of varied but related ideas or objects, the individual features of which tend to overlap to form a continuous series or sequence, such as the spectrum of political beliefs.</li><li>The range of traits and behaviors considered characteristic of autism spectrum disorder.</li></ul>