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definition of the word spectrum

by the Wiktionnary

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spectra or spectrums

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.

Definition from Wiktionary
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