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English definition of “spectrum”

spectrum

noun [C] (COLOURS)    /ˈspek.trəm/ (plural spectra or spectrums)
C2 the set of colours into which a beam of light can be separated, or a range of waves, such as light waves or radio waves: The colours of the spectrum - red, orange, yellow, green, blue, indigo, and violet - can be seen in a rainbow.Colour - general words
(Definition of spectrum noun (COLOURS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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