spectrum

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English[edit]

The visible spectrum
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Etymology[edit]

From Latin spectrum (appearance, image, apparition), from speciō (look at, view). (see scope)

Pronunciation[edit]

Noun[edit]

spectrum (plural spectra or spectrums)

  1. Specter, apparition. [from early 17th c.]
  2. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
  3. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. [from later 17th c.]
    • 2010 October 30, Jim Giles, Jammed!, in New Scientist,
      Current 3G technologies can send roughly 1 bit of data - a one or a zero - per second over each 1 Hz of spectrum that the operator owns.
  4. (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
  5. (mathematics, linear algebra) The set of eigenvalues of a matrix.
  6. (mathematics, functional analysis) Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.

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Translations[edit]

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Anagrams[edit]


Latin[edit]

Etymology[edit]

From speciō (look at, behold).

Pronunciation[edit]

Noun[edit]

spectrum n (genitive spectrī); second declension

  1. appearance, image
  2. apparition, specter

Inflection[edit]

Second declension neuter.

Number Singular Plural
nominative spectrum spectra
genitive spectrī spectrōrum
dative spectrō spectrīs
accusative spectrum spectra
ablative spectrō spectrīs
vocative spectrum spectra

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