Meaning of SPECTRUM in English


■ noun ( plural spectra -trə )

1》 a band of colours produced by separation of the components of light by their different degrees of refraction according to wavelength, e.g. in a rainbow.

↘the entire range of wavelengths of electromagnetic radiation.

↘a characteristic series of frequencies of electromagnetic radiation emitted or absorbed by a substance.

↘the components of a sound or other phenomenon arranged according to frequency, energy, etc.

2》 a scale extending between two points; a range: the political ~.


C17 (in the sense 'spectre'): from L., lit. 'image, apparition', from specere 'to look'.

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