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Perfect passive participle of apō (fasten, join).



aptus m (feminine apta, neuter aptum); first/second declension

  1. suitable, adapted
  2. ready
  3. apt, proper
  4. tied, attached (to)
  5. dependent (on)


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative aptus apta aptum aptī aptae apta
Genitive aptī aptae aptī aptōrum aptārum aptōrum
Dative aptō aptō aptīs
Accusative aptum aptam aptum aptōs aptās apta
Ablative aptō aptā aptō aptīs
Vocative apte apta aptum aptī aptae apta

Derived terms[edit]



  • aptus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • aptus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • aptus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • aptus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to be closely connected with each other: conexum et aptum esse inter se
    • systematic succession, concatenation: continuatio seriesque rerum, ut alia ex alia nexa et omnes inter se aptae colligataeque sint (N. D. 1. 4. 9)
    • (ambiguous) to be very intimately related: apte (aptissime) cohaerere
  • apt in The Century Dictionary, The Century Co., New York, 1911