definition of the word spectrum

Wikipedia has an article on:

Spectrum

Wikipedia

• (Canada, UK) IPA: /ˈspektrəm/
• (unknown) IPA: /ˈspɛktrəm/, SAMPA: /"spEktr@m/

• Rhymes: -ɛktrəm

•  Audio (US)^{help, file}

spectrum (plural spectra or spectrums)

1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
2. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
3. (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
4. (linear algebra) Of a bounded linear operator A, the scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse.

• light spectrum

• spectral

Definition from Wiktionary Content avaible with GNU Free Documentation License

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