Etymologically

Etymology and origin of the Latin word cognatio

Confidence
Established
Formation
Derivation
First attested
86/82 BC, Rhetorica ad Herennium
Ultimate origin
Latin (nāscor)

Pronunciation

  • Classical: [kɔŋˈnaː.ti.oː][1]
  • Ecclesiastical: [koɲˈɲat.t͡si.o][1]

Forms

cognātiō f (genitive cognātiōnis); third declension[1]

Etymology

It is formed from cognātus (“related by blood”) with -tiō, beside nātiō (“birth, people”).[2][3][1] ⟨Cognātus⟩ comes from nāscor (“to be born”), which de Vaan traces to Proto-Italic *gnāsk-e/o- (“to be born”) and Proto-Indo-European *ǵnh₁-sk-e/o- (“to be born”); he compares Umbrian natine (“patrician family”), from a similar suffixed noun.[4] The jurist Paulus thought the name came from Ancient Greek συγγενεῖς (sungeneîs, “relatives”).[3]

Earliest recorded meaning

The OLD's earliest example is the Rhetorica ad Herennium, which names kinship as a ground of natural law;[2] Köbler's first source is Cicero.[5]

Semantic evolution

It is blood relationship, kinship, and collectively the kinsfolk: Cicero writes of a son who bore the shame of his family, kin and name hard.[2][6] An inscription has a guild of kinsmen, and Martial uses cāra cognātiō for the family feast of the Caristia.[2] Seneca reports Pythagoras' teaching of the kinship of all things, and it is used of the affinity of plants, of a natural family, and of words: Varro follows the kinship of words.[2]

Church Latin glosses it “kindred, relationship, progeny, descendant”.[7]

Timeline

  • 86/82 BC – the Rhetorica ad Herennium of kinship.[2][5]
  • 116–27 BC – Varro of the kinship of words.[2][5]
  • 81–43 BC – Cicero of a man's kin.[2][5]
  • 40–102/103 AD – Martial of the Caristia.[2][5]

Meanings

Noun

  1. Blood relationship, kinship, consanguinity; kinsfolk; a guild of kinsmen.[2][6][1][7]
  2. Relationship, affinity of things; a natural class.[2][1]
  3. (Ecclesiastical Latin) Progeny, descendants.[7]

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  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 d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ a b Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  7. ^ a b c Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Cite this entry

“Cognatio.” Etymologically, 19 Oct. 2026, etymologically.com/la/cognatio. Accessed 20 Oct. 2026.

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