noun

spectrum

/ˈspɛktrəm/ · say it: SPEK·truhm

the range of colors or wavelengths of light

In Science & Nature

In more detail

1. (noun) the range of colors that you see when white light is separated, for example by a prism

2. (noun) a range of things that varies by degree from one extreme to another

3. (noun) a range of particular qualities or characteristics

Examples

1. A rainbow shows the full spectrum of visible light.
2. The political spectrum ranges from left-wing to right-wing views.
3. The autism spectrum includes people with varying levels of support needs.

How to use spectrum

Spectrum is used both literally to describe the visible colors in light (often with 'visible' or 'light') and figuratively to describe any continuous range of things arranged by degree or quality. It emphasizes gradation and variety within a unified whole, making it useful for discussing diversity of views, abilities, or characteristics. More abstract and scientific in tone than simple 'range.'

Common phrases

across the spectrum
broad spectrum
the full spectrum
spectrum of opinion
spectrum disorder

Synonyms

gamut · range · scope · breadth · continuum

Word family

spectral (adjective)

A common mistake

Learners sometimes use 'spectrum' when they mean a simple 'range' or 'variety' without the implication of gradation or continuity between extremes; spectrum works best when items progress along a scale.

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