Etymologically

Etymology and origin of the Latin word adiuro

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Latin (iūs)
Etymology tree
inherited borrowed derived
Latin ius
Latin iuro
French jurer
Latin eiuro
Latin coniuro
Latin coniuratio
Latin adiuro
Latin iustitium

Pronunciation

  • Classical: [adˈjuː.roː][1]
  • Ecclesiastical: [adˈjuː.ro][1]

Forms

adiūrō (present infinitive adiūrāre, perfect active adiūrāvī, supine adiūrātum); first conjugation[1]

Etymology

It is from Latin ad- + iūrō (“to swear”).[2][3] De Vaan lists it among the derivatives of iūs2 (“law, oath”), from which iūrō was formed as a denominative verb, Proto-Italic *jowes-ā-je-;[4] Old Latin has the third person ⟨iouvesat⟩ “swears” in the Duenos inscription.[4] He traces iūs2 to an s-stem going back to Proto-Indo-European *h₂oi-u (“vital force, eternity”).[4] Ancient commentators on Virgil explained the prefix as a mere addition to iūrō or as meaning “very”;[3] Servius also reports that some reserved the compound for swearing that something was not so.[3]

Earliest recorded meaning

De Vaan records it from Plautus on.[4] In the Amphitruo a character demands that the other “swear besides” that he did not mean what he said (adiuret insuper nolle esse dicta).[2][3]

Semantic evolution

In Classical Latin it means to affirm something on oath, with an accusative and infinitive, with ut or absolutely, in Plautus, Terence, Cicero, Livy, Suetonius and Statius.[2][3] Livy also uses it of swearing something in addition to the common oath of all citizens.[5] With a direct object it means to swear by a person or thing: Catullus swears by a head, and Virgil by the head of the Stygian spring.[2][3]

In later Latin it came to mean to put someone under oath, and to entreat someone earnestly, as in Lactantius, Vopiscus and the Vulgate.[3][5] Christian writers such as Minucius Felix and Lactantius use it of adjuring demons by the name of God, that is, of exorcising them.[5][3] In Ecclesiastical Latin it means to adjure or swear.[6] From it English took adjure in the late 14th century.[7]

Timeline

  • c. 250–184 BC – Plautus uses it of affirming something on oath.[2][8]
  • 190–159 BC – Terence uses it with per omnis deos.[2][8]
  • 70–19 BC – Virgil uses it of swearing by the Stygian spring.[2][8]
  • c. 250–317 AD – Lactantius uses it of adjuring demons by God.[5][8]
  • 390–406 AD – The Vulgate uses it of putting under oath and of entreating.[5][8]
  • late 14th century – English borrows it as adjure.[7]

Meanings

Verb

  1. To affirm with an oath, to swear (that something is so); to swear in addition.[2][5]
  2. To swear by (a god, a person or thing).[2][3]
  3. (Late Latin) To put under oath; to entreat earnestly, conjure.[3][5]
  4. (Ecclesiastical Latin) To adjure (demons), to exorcise.[5][6]

Word family

  • adiūrāmentum
  • adiūrātiō
  • adiūrātor
  • adiūrātōrius

Usage notes

Georges notes a different word adiūrō, an old contracted form of the future perfect adiūverō of adiuvō.[5][9]

References

  1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f g h i j Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d 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 d e f g h i Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  6. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  7. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  8. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  9. ^ Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
Cite this entry

“Adiuro.” Etymologically, 20 Oct. 2026, etymologically.com/la/adiuro. Accessed 20 Oct. 2026.

Last edited on . ·