Etymologically

foederatus

Etymology and origin of the Latin word foederatus

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Proto-Indo-European (*bʰeidʰ-e/o-)
Etymology tree
inherited borrowed derived
Latin foedus
Latin foeditas
Latin foederatus
Latin foede

Forms

foederātus (feminine foederāta, neuter foederātum); first/second-declension adjective[1][2] The Senate's decree on the Bacchanalia has the old spelling foideratei.[3][4]

Etymology

It is from Latin foedus (“treaty”) + -ātus.[1][4] De Vaan places foedus among the derivatives of fīdō (“to trust”), from Proto-Italic *feiþ-os- (“trust”), and traces the root to Proto-Indo-European *bʰeidʰ-e/o- (“to trust”).[3] Cognate with Ancient Greek πείθομαι (peíthomai, “to be convinced, obey”) and Albanian besë (“faith”).[3]

Earliest recorded meaning

Köbler dates it from Cicero,[5] who uses it of states bound by treaty to Rome.[1][2]

Semantic evolution

It names a class of allies bound to Rome by treaty, federated peoples or states, as Cicero's “the federated and pacified soil of the Mamertines”.[1][2] As a noun, foederati are the allies, and Cicero calls a man the patron of treaties and of allies.[2][6] Livy uses it figuratively, of having nothing in alliance with someone.[1][6] Suetonius has federated peoples, and Church Latin glosses it “united, allied, federated”.[2][7]

Timeline

  • 81–43 BC – Cicero of federated states and their patrons.[2][6][5]
  • 59 BC–17 AD – Livy figuratively.[1][5]
  • c. 75–c. 150 AD – Suetonius of federated peoples.[2][5]

Meanings

Adjective

  1. Bound by treaty to Rome, federated, allied.[1][2][7]
  2. (figurative) In alliance, joined.[1][6]

Noun

  1. (masculine plural) The allies, the federated peoples.[2][6]

Word family

  • foederaticus

References

  1. ^ a b c d e f g h Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  2. ^ 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
  3. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  4. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ a b c d e Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Cite this entry

“Foederatus.” Etymologically, 19 Oct. 2026, etymologically.com/la/foederatus. Accessed 20 Oct. 2026.

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