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Derived from the perfect passive participle of cernō.[1]



certus m ‎(feminine certa, neuter certum); first/second declension

  1. certain
  2. fixed, settled, firm
  3. resolved, determined
  4. sure


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative certus certa certum certī certae certa
genitive certī certae certī certōrum certārum certōrum
dative certō certō certīs
accusative certum certam certum certōs certās certa
ablative certō certā certō certīs
vocative certe certa certum certī certae certa

Derived terms[edit]



  • certus” in Charlton T. Lewis & Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879.
  • certus” in Félix Gaffiot (1934), Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • the fixed stars: sidera certis locis infixa
    • this much is certain: hoc (not tantum) certum est
    • I am quite certain on the point: mihi exploratum est, exploratum (certum) habeo
    • I am determined: certum (mihi) est
    • I am firmly resolved: certum deliberatumque est
    • to impose fixed limitations: fines certos terminosque constituere
    • (ambiguous) I know for a fact: certo (certe) scio (Arch. 12. 32)
    • (ambiguous) this much I can vouch for: illud pro certo affirmare licet
    • (ambiguous) to be based on a sound principle: a certa ratione proficisci
  • certus” in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016
  1. ^ “certo” in: Alberto Nocentini, Alessandro Parenti, “l'Etimologico — Vocabolario della lingua italiana”, Le Monnier, 2010, ISBN 978-88-00-20781-2