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From Latin socius


socius (plural socii)

  1. (historical) Any of the autonomous tribes and city states of the Italian Peninsula in permanent military alliance with the Roman Republic until the Social War of 91–88 BC.
  2. An associate; a fellow of an academy, etc.
  3. (sociology) According to Gilles Deleuze, a social body that takes credit for production.



Alternative forms[edit]


From Proto-Indo-European *sokʷ-yo- (companion), from Proto-Indo-European *sekʷ- (to follow)[1]. Compare Faliscan socia (girlfriend, companion).



socius (feminine socia, neuter socium); first/second-declension adjective

  1. sharing, joining in, partaking, associated
  2. kindred, related, akin, ally
  3. leagued, allied, united, confederate


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative socius socia socium sociī sociae socia
Genitive sociī sociae sociī sociōrum sociārum sociōrum
Dative sociō sociō sociīs
Accusative socium sociam socium sociōs sociās socia
Ablative sociō sociā sociō sociīs
Vocative socie socia socium sociī sociae socia

Derived terms[edit]

Related terms[edit]


  • Eastern Romance:
    • Aromanian: sots
    • Romanian: soț
  • Italian: soccio
  • Albanian: shok
  • Catalan: soci
  • Italian: socio
  • Portuguese: sócio
  • Spanish: socio
  • Welsh: saig
  • Latin: socia f


socius m (genitive sociī or socī); second declension

  1. partner, sharer, associate
  2. companion, comrade
  3. ally; confederate


Second-declension noun.

Case Singular Plural
Nominative socius sociī
Genitive sociī
Dative sociō sociīs
Accusative socium sociōs
Ablative sociō sociīs
Vocative socie sociī

1Found in older Latin (until the Augustan Age).


  • socius in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • socius in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • socius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • socius in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to attach oneself to a person's society: socium se adiungere alicui
    • to admit a person into one's society: aliquem socium admittere
    • a political ally: consiliorum in re publica socius
    • to make some one one's ally: socium aliquem asciscere (B. G. 1. 5)
  • socius in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
  • Notes: