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From Old Latin aecus, of unknown origin.[1][2] Encyclopedia Brittanica compares the Italic tribe Aequi and its adjectival form aequicus.[3]



aequus (feminine aequa, neuter aequum, comparative aequior, superlative aequissimus, adverb aequē or aequiter); first/second-declension adjective

  1. equal
  2. level, even, flat, horizontal
  3. calm
  4. fair, impartial
  5. just


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative aequus aequa aequum aequī aequae aequa
Genitive aequī aequae aequī aequōrum aequārum aequōrum
Dative aequō aequō aequīs
Accusative aequum aequam aequum aequōs aequās aequa
Ablative aequō aequā aequō aequīs
Vocative aeque aequa aequum aequī aequae aequa

Derived terms[edit]

Related terms[edit]


  • English: equ-
  • Italian: equo
  • Portuguese: équo


  1. ^ “equo” in: Alberto Nocentini, Alessandro Parenti, “l'Etimologico — Vocabolario della lingua italiana”, Le Monnier, 2010, →ISBN
  2. ^ De Vaan, Michiel (2008) , “aequus”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN
  3. ^ The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and General Information, Volumes 1-2, p. 258-59

Further reading[edit]

  • aequus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • aequus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • aequus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • (ambiguous) friend and foe: aequi iniqui
    • (ambiguous) to endure a thing with (the greatest) sang-froid: aequo (aequissimo) animo ferre aliquid
    • (ambiguous) justly and equitably: ex aequo et bono (Caecin. 23. 65)
    • (ambiguous) a sound judicial system: aequa iuris descriptio (Off. 2. 4. 15)
    • (ambiguous) to live with some one on an equal footing: aequo iure vivere cum aliquo
    • (ambiguous) in a favourable position: idoneo, aequo, suo (opp. iniquo) loco