Definition of spectrum noun from the Oxford Advanced American Dictionary

     

    spectrum

     noun
    noun
    NAmE//ˈspɛktrəm//
     
    (pl. spectra
    NAmE//ˈspɛktrə//
     
    )
     
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  1. 1a band of colored lights in order of their wavelengths, as seen in a rainbow and into which 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. 2 a range of sound waves or several other types of waves the electromagnetic/radio/sound spectrum
  3. 3 [usually singular] a complete or wide range of related qualities, ideas, etc. a broad spectrum of interests We will hear views from across the political spectrum.
See the Oxford Advanced Learner's Dictionary entry: spectrum