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spectrum

Etymology and origin of the English word spectrum

History Permalink
Confidence
Established
Formation
Borrowing
First attested
1611
Borrowed from
Latin spectrum
Ultimate origin
Latin (specio)
Etymology tree
inherited borrowed derived
Latin spectrum
English spectrum

Pronunciation

  • IPA: /ˈspɛktɹəm/[1]

Etymology

It is borrowed from Latin spectrum (“appearance, image, apparition”),[2][3][4] from specere (“to look at”) (see spectre and spy),[2][3][5] from PIE Proto-Indo-European *spek- (“to observe”).[3]

Earliest recorded meaning

An apparition or spectre: 1611, in John Speed's History of Great Britain;[2][6] this sense is now obsolete or archaic.[3][7]

Semantic evolution

The coloured band formed when a beam of light passes through a prism is first recorded in 1671, in Newton's writings.[2][6] An after-image left on the retina is from 1786.[6] The whole range of wavelengths of electromagnetic radiation is by 1888,[3][6] and an arrangement of the parts of any phenomenon by degree from 1887.[6] The figurative sense, the entire range of something, as in the political spectrum, is from 1936.[3][6]

Timeline

  • 1611 – an apparition.[2][6]
  • 1671 – the colours of light, in Newton.[2][6]
  • 1786 – an after-image.[6]
  • 1888 – the range of wavelengths.[3][6]
  • 1936 – any full range.[3][6]

Modern meaning

Noun

  1. The band of colours, from red to violet, formed when white light is split by a prism.
  2. The entire range of wavelengths of electromagnetic radiation, or a part of it: the radio spectrum.
  3. A wide range of related qualities, ideas or activities: across the political spectrum.

Word family

  • spectro-
  • broad-spectrum
  • absorption spectrum
  • band spectrum
  • line spectrum
  • mass spectrum
  • emission spectrum
  • spectral
  • spectre
  • spectacle
  • spectator
  • spectroscope
  • spy
  • inspect

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  3. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ Pearsall, Judy, ed. (1998), The New Oxford Dictionary of English, Oxford: Clarendon Press
  6. ^ a b c d e f g h i j k Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
  7. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press

Related etymologies

Cite this entry

“Spectrum.” Etymologically, 16 Oct. 2026, etymologically.com/en/spectrum. Accessed 16 Oct. 2026.

Last edited on . ·