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fraternus

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Etymology and origin of the Latin word fraternus

Confidence
Established
Formation
Derivation
First attested
220–130 BC, Pacuvius
Ultimate origin
Proto-Indo-European (*bʰréh₂-tr-)

Pronunciation

  • Classical: [fraːˈtɛr.nʊs][1]
  • Ecclesiastical: [fraˈtɛr.nus][1]

Forms

frāternus (feminine frāterna, neuter frāternum, adverb frāternē); first/second-declension adjective[1]

Etymology

It is formed from frāter (“brother”) with -nus.[2][3][4] De Vaan derives ⟨frāter⟩ from Proto-Italic *frāter- and Proto-Indo-European *bʰréh₂-tr- (“brother”).[5] Cognate with Umbrian frater (“brothers”), Sanskrit भ्रातृ (bhrā́tṛ, “brother”), Ancient Greek φράτηρ (phrā́tēr, “member of a brotherhood”) and Lithuanian brólis (“brother”).[5]

Earliest recorded meaning

Pacuvius has “a brother's exile”;[2] Köbler also gives Pacuvius.[6]

Semantic evolution

It is of or belonging to a brother or brothers, as Caesar's man moved by brotherly love and by public opinion, and in an unknown tragedy of a cousin, where Ajax claims the right to his cousin Achilles' arms.[2][3] It is fitting for a brother, brotherly or fraternal, as Cicero's “how generous, how brotherly an invitation!”.[2][3][1] Wiktionary also gives “of a kinsman” and “friendly, close”.[1]

Church Latin glosses it “fraternal, brotherly”.[7]

Timeline

  • 220–130 BC – Pacuvius of a brother's exile.[2][6]
  • 81–43 BC – Cicero of a brotherly invitation.[2][6]
  • c. 50 BC – Caesar of brotherly love.[3][6]

Meanings

Adjective

  1. Of a brother or brothers; of a cousin or kinsman.[2][3][1]
  2. Brotherly, fraternal; friendly, close.[2][3][1][7]

Word family

  • frāternitās
  • frāternālis
  • frāternē

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 h Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Cite this entry

“Fraternus.” Etymologically, 19 Oct. 2026, etymologically.com/la/fraternus. Accessed 19 Oct. 2026.

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