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Etymology 1[edit]

From necesse (necessary) +‎ -ārius (adjective-forming suffix).


necessārius (feminine necessāria, neuter necessārium, comparative necessarior, superlative necessarissimus, adverb necessāriē or necessāriō); first/second-declension adjective

  1. unavoidable, inevitable
  2. indispensable, requisite

First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative necessārius necessāria necessārium necessāriī necessāriae necessāria
Genitive necessāriī necessāriae necessāriī necessāriōrum necessāriārum necessāriōrum
Dative necessāriō necessāriō necessāriīs
Accusative necessārium necessāriam necessārium necessāriōs necessāriās necessāria
Ablative necessāriō necessāriā necessāriō necessāriīs
Vocative necessārie necessāria necessārium necessāriī necessāriae necessāria
Derived terms[edit]
Related terms[edit]

Etymology 2[edit]

From necesse (necessary) +‎ -ārius (-er, agent noun suffix).


necessārius m (genitive necessāriī or necessārī); second declension

  1. friend
  2. kinsman
  3. patron

Second-declension noun.

Case Singular Plural
Nominative necessārius necessāriī
Genitive necessāriī
Dative necessāriō necessāriīs
Accusative necessārium necessāriōs
Ablative necessāriō necessāriīs
Vocative necessārie necessāriī

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


  • necessarius in Charlton T. Lewis and Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879
  • necessarius in Charlton T. Lewis, An Elementary Latin Dictionary, New York: Harper & Brothers, 1891
  • necessarius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • necessarius in Gaffiot, Félix, Dictionnaire illustré Latin-Français, Hachette, 1934
  • Carl Meissner; Henry William Auden, Latin Phrase-Book[1], London: Macmillan and Co., 1894
    • cogent, decisive reasons: magnae (graves) necessariae causae
    • a comfortably-furnished house: domus necessariis rebus instructa
    • the necessaries of life: res ad vitam necessariae
    • things indispensable to a life of comfort: res ad victum cultumque necessariae
    • (ambiguous) to die a natural death: necessaria (opp. voluntaria) morte mori
  • necessarius in Ramminger, Johann, Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016, retrieved 16 July 2016