Etymologically

Etymology and origin of the Latin word iniectio

Confidence
Established
Formation
Derivation
First attested
c. 450 BC, Twelve Tables
Ultimate origin
Latin iniciō
Etymology tree
inherited borrowed derived
Latin inicio
Latin iniectio
English injection
From the same root
Latin iniecto ← inicio

Pronunciation

  • Classical: [ɪnˈjɛk.ti.oː][1]
  • Ecclesiastical: [inˈjɛk.t͡si.o][1]

Forms

iniectiō f (genitive iniectiōnis); third declension[1] Manuscripts of the Latin Oribasius often have enectio.[2]

Etymology

It is from Latin iniciō (“to throw in or on”) + -tiō.[3][1] The verb is made from in- and iaciō (“to throw”).[4]

Earliest recorded meaning

Its first record is the phrase manūs iniectiō in the Twelve Tables, as quoted by Gellius: after thirty days' grace for a confessed debt, post deinde manūs iniectiō estō “after that let there be a laying on of the hand”.[5][2][6]

Semantic evolution

In Roman law manūs iniectiō, the laying on of the hand, was the act by which a person seized someone on whom he had a legal claim, or property he claimed as his own, without a judge's decision.[3][5] Quintilian cites a law giving a patron this right over his freedman, and Seneca speaks of true goods on which no hand can be laid.[5] Outside this phrase the TLL finds the word only from Tertullian and the Old Latin Bible on, and never in poetry.[2]

Medical writers used it of an injection or enema, as Caelius Aurelianus and the veterinary writer Vegetius do.[5][2] Tertullian used it figuratively of the prompting of Satan and of an objection raised in argument.[5] Medieval Latin made manuum iniectiō the laying of violent hands on a person, above all on a cleric, which incurred excommunication;[7][8] it also kept the medical injection and the putting of an idea into someone's mind.[8] English injection comes from it, directly or through Old French, in the early 15th century.[4]

Timeline

  • c. 450 BC – The Twelve Tables prescribe manūs iniectiō against a judgment debtor.[5][2][6]
  • 4 BC–65 AD – Seneca speaks of goods on which no hand can be laid.[5][6]
  • c. 35–95/96 AD – Quintilian cites a patron's right of manūs iniectiō over his freedman.[5][6]
  • c. 160–220 AD – Tertullian uses it of the prompting of Satan.[5][6]
  • 5th century AD – Caelius Aurelianus uses it of an injection.[5][6]
  • early 15th century – English borrows injection.[4]

Meanings

Noun

  1. (law) manūs iniectiō: the laying on of the hand, by which a person seized someone or something he had a claim on.[3][5]
  2. A throwing in;[5][2][1] (medicine) an injection, enema.[5][2][1]
  3. (Late Latin) A suggestion, instigation; an objection.[5][1]
  4. (Medieval Latin) manuum iniectiō: a violent assault on a person.[7][8]

Word family

  • iniectionale

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  3. ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  4. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  5. ^ a b c d e f g h i j k l m n Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  8. ^ a b c 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

Borrowed into

Cite this entry

“Iniectio.” Etymologically, 23 Oct. 2026, etymologically.com/la/iniectio. Accessed 23 Oct. 2026.

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