Meaning of SPECTRUM in English

SPECTRUM

/ ˈspektrəm; NAmE / noun ( pl. spec·tra / ˈspektrə; NAmE /)

1.

a band of coloured 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.

a range of sound waves or several other types of wave :

the electromagnetic / radio / sound spectrum

3.

[ usually sing. ] a complete or wide range of related qualities, ideas, etc. :

a broad spectrum of interests

We shall hear views from across the political spectrum.

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WORD ORIGIN

early 17th cent. (in the sense spectre ): from Latin , literally image, apparition , from specere to look.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.