EnglishMain Dictionary
spectrum
Universal Words
1 a band of coloured lights in order of their WAVELENGTHS, as seen in a RAINBOW and into which a ray of light may be separated:
A spectrum is formed by a ray of light passing through a prism. * Red and violet are at opposite ends of the spectrum.
2 a range of sound waves or several other types of wave:
the electromagnetic / radio / sound spectrum
3 [usuallysing.] (written) a complete or wide range of related qualities, ideas, etc:
a broad spectrum of interests * We shall hear views from across the political spectrum.
