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plenary

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Etymology and origin of the English word plenary

Confidence
Established
Formation
Borrowing
First attested
1425 before 1425, translation of Guy de Chauliac's Grande Chirurgie
Borrowed from
Latin plenarius via Middle English
Ultimate origin
Latin plēnus

Pronunciation

  • UK: /ˈpliːnəɹi/[1]
  • US: /ˈpliːnəɹi/, /ˈplɛnəɹi/[1]

Etymology

It is inherited from Middle English plenarie,[2][3] borrowed from Late Latin plēnārius (“entire, complete; fully attended”),[4][5][6][7] recorded from the late 4th century in Augustine, in the phrase plenarium concilium.[6] Etymonline also names Old French plenier as a source.[3] The Latin adjective is formed from plēnus (“full”) and -ārius,[6][5] and plēnus comes from Proto-Indo-European *pele- (“to fill”), according to Etymonline and the American Heritage Dictionary.[3][4] It replaced the earlier Middle English plener, recorded from about 1250, borrowed through Anglo-French plener and the Old French word.[8][9] Spanish plenario and Italian plenario are parallels.[6]

Earliest recorded meaning

Full, complete or perfect: before 1425, in a translation of Guy de Chauliac's Grande Chirurgie, with plenarye doctrine.[6][2] Barnhart dates the word to 1517.[8]

Semantic evolution

The word was first used in medicine and theology.[3] Of an assembly, "attended by all members", it is recorded from 1483, in Caxton's edition of Mirk's Festial,[6] and Etymonline dates that use to the 1530s.[3] In law a plenary suit was one heard under full formal procedure, as opposed to a summary one (1726).[6] The phrase plenary power, full authority, is recorded by 1817.[3] In the 20th century the adjective was used of what is presented at a full session (1907), and the noun came to mean such a session itself (1969).[6] The OED notes that Johnson's sense "decisive procedure", copied by later dictionaries, rests on a misprint of plenarty in Ayliffe.[6]

Timeline

  • before 1425 – full, complete, absolute.[6][2]
  • 1483 – of an assembly, attended by all members.[6]
  • 1726 – in law, of a suit, heard under full procedure.[6]
  • 1817 – plenary power, full authority.[3]
  • 1907 – presented at or belonging to a full session.[6]
  • 1969 – noun, a session attended by all participants.[6]

Meanings

Adjective

  1. Full and complete in every respect; absolute or unqualified: plenary powers.[10][5][6]
  2. Of a meeting or assembly, attended by all its members: a plenary session.[10][5][6]
  3. (law) Of a suit or action, dealt with under full formal procedure, not summary.[6]

Noun

  1. A meeting attended by all participants at a conference.[6]
  2. A book containing the gospels or epistles read at the Eucharist.[10][6]

Word family

  • plenarily
  • plenariness
  • plenary indulgence

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  5. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  6. ^ a b c d e f g h i j k l m n o p q r s Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  7. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  8. ^ a b Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  9. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  10. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins

Related etymologies

Cite this entry

“Plenary.” Etymologically, 2 Nov. 2026, etymologically.com/en/plenary. Accessed 2 Nov. 2026.

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