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/ˈspektɹəm/ · spec·trum
noun
  1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes. The temperature spectrum in the city varied greatly during the winter months.
  2. A range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. The visible spectrum of light is often depicted as a rainbow.
  3. The autism spectrum. Research has shown that individuals on the autism spectrum often possess unique cognitive abilities.
Did you know? The term 'spectrum' is also used in music to describe a range of notes or frequencies, often used in musical compositions to create a sense of tension or resolution.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 15, 2026