Etymologically

plenarius

Etymology and origin of the Latin word plenarius

Confidence
Established
Formation
Derivation
First attested
c. 340–397 Ambrose More words from the 4th century
Ultimate origin
Latin plēnus
Etymology tree
inherited borrowed derived
Latin plēnus
French plein
Italian pieno
Spanish lleno
Latin plēnārius
English plenary
Spanish plenario
From the same root
Latin plēnē ← plēnus
Latin plēnilūnium ← plēnus
Latin plēnitās ← plēnus

Pronunciation

  • Classical: [pɫeːˈnaː.ri.ʊs][1]
  • Ecclesiastical: [pleˈnaː.ri.us][1]

Forms

plēnārius (feminine plēnāria, neuter plēnārium); first/second-declension adjective[1]

Etymology

It is from Latin plēnus (“full”) + -ārius.[1][2][3] plēnus goes back to Proto-Italic *plēno- and Proto-Indo-European *pl̥h₁-nó- (“full”).[4]

Earliest recorded meaning

The TLL records it from Ambrose on, who speaks of three full blessings received; it means full, complete.[2][3]

Semantic evolution

In Late Latin it was a prose word, used mostly by Church writers and in law.[2] Augustine speaks of a plenarium concilium, a full or plenary council of the Church,[5] a sense that medieval Latin kept for plenary assemblies.[6][7]

Medieval Latin used it widely for what is full or entire: a full measure of land, a full tithe, a whole period of time.[8] As a noun, plenarius or plenarium was a missal or a book containing the Gospels and Epistles, and plenarium also an inventory of all the estates of a religious house, or a reliquary.[6] English took the adjective as plenar in the mid-13th century and as plenary in the early 15th, partly through Old French.[9]

Timeline

  • c. 340–397 AD – Ambrose uses it for something full and complete.[2][3]
  • 354–430 AD – Augustine writes of a plenary council.[5][3]
  • 1123 – A Bath charter speaks of a full tithe.[8]
  • early 15th century – English has plenary, from Old French and directly from medieval Latin.[9]

Meanings

Adjective

  1. Full, complete, entire.[2][6][7]
  2. (of a meeting) Plenary.[6][5]

Noun

  1. (Medieval Latin) A missal; a book containing the Gospels and Epistles.[6]
  2. (Medieval Latin, neuter plenarium) An inventory of all the estates of a religious house; a reliquary.[6]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  3. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  5. ^ a b c Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  6. ^ a b c d e f Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  8. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  9. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
Cite this entry

“Plenarius.” Etymologically, 7 Nov. 2026, etymologically.com/la/plenarius. Accessed 8 Nov. 2026.

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