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radiance

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Etymology and origin of the English word radiance

Confidence
Established
Formation
Derivation
First attested
1593 before 1593, Marlowe's translation of Ovid's Elegies More words from the 16th century
Ultimate origin
Latin radiō
Etymology tree
inherited borrowed derived
English radiant
English radiance

Pronunciation

  • /ˈɹeɪdi.əns/[1]

Etymology

It is formed from English radiant + -ance,[2][3][4][5] after such pairs as attendant and attendance.[4] Etymonline allows as an alternative a source in Medieval Latin radiantia (“brightness”).[5] The adjective is from Latin radiāns (“beaming, shining”), the present participle of radiō (“to beam, shine”).[2][5] Forms in -ence are also recorded.[2]

Earliest recorded meaning

Brightness, brilliant light given off by something: before 1593, in Marlowe's translation of Ovid's Elegies,[2] about 1593 in Merriam-Webster Unabridged.[4] Etymonline dates the word to about 1600 and Dictionary.com to 1595–1605,[5][3] while the Shorter Oxford puts it as early as the mid-16th century.[6] Radiancy, formed in the same way, is recorded from 1595, in Drayton.[2]

Semantic evolution

From physical light the word soon moved to figurative brightness: it is used figuratively by 1600, in Dekker,[2] though Etymonline dates the figurative use of beauty and joy only to 1761.[5] In 1608, in Chapman, it describes a brightness of eye or expression that shows joy, love or hope.[2] Science later took it up, first for radiation perceived as heat or light, in Herschel in 1800, a use dead by 1885,[2] and then, from 1917, as a strict measure in physics, the flux of radiation given off per unit solid angle by a unit area of a source.[2][6][7]

Timeline

  • before 1593 – brightness, splendid light.[2][4]
  • 1600 – figurative brightness.[2]
  • 1608 – a joyful brightness in a person's eye or bearing.[2]
  • 1800 – radiation perceived as heat or light (obsolete by 1885).[2]
  • 1917 – in physics, the flux of radiation per unit solid angle from a unit area of a source.[2][6]

Meanings

Noun

  1. Bright or glowing light; vivid brightness; splendor: the radiance of the rising sun over the bay.[7][4][2]
  2. A glowing quality in a person's face or bearing that shows joy, love or hope.[2][7]
  3. (physics) The flux of radiation given off in a given direction, per unit solid angle and per unit area of the source.[2][4][7][6]
  4. (obsolete, 1800–85) Radiation perceived as heat or light, or the giving off of such radiation.[2][6]

Word family

  • subradiance
  • superradiance

Usage notes

The Century Dictionary, quoted by Etymonline, distinguished radiance, generally a light pleasant to the eyes and so often chosen for figurative use, from brilliance, a light that is strong, often too strong to be agreeable, and marked by play and penetration.[5]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  4. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  7. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins

Related etymologies

Cite this entry

“Radiance.” Etymologically, 6 Nov. 2026, etymologically.com/en/radiance. Accessed 6 Nov. 2026.

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