spectrum

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spec|trum /sp'ektrəm/ (spectraor spectrums)
1 [N-SING] the N
The spectrum is the range of different colours which is produced when light passes through a glass prism or through a drop of water. A rainbow shows the colours in the spectrum.
2 [N-COUNT] usu sing, with supp
A spectrum is a range of a particular type of thing.
Politicians across the political spectrum have denounced the act...
The term `special needs' covers a wide spectrum of problems.
3 [N-COUNT]
A spectrum is a range of light waves or radio waves within particular frequencies.
Vast amounts of energy, from X-rays right through the spectrum down to radio waves, are escaping into space...

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