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spectrum

 
/ˈspek·trəm/ n [C] (plural spectra /ˈspek·trə/ or spectrums) (COLORS) physics

Definition

the set of colors into which a beam of light can be separated Spectrum also means a range of waves such as light waves or radio waves.
(Definition of spectrum n (COLORS) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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