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See also: Ianuarius



From the name of the god Iānus (Janus).



iānuārius (feminine iānuāria, neuter iānuārium); first/second declension

  1. Of January.

Usage notes[edit]

In Latin, the month names are used as adjectives. In the Classical period, this adjective modifies a noun identifying a particular day, from which the date was reckoned. In Medieval Latin and later periods, the adjective modifies a numeral for the day of the month.


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative iānuārius iānuāria iānuārium iānuāriī iānuāriae iānuāria
genitive iānuāriī iānuāriae iānuāriī iānuāriōrum iānuāriārum iānuāriōrum
dative iānuāriō iānuāriō iānuāriīs
accusative iānuārium iānuāriam iānuārium iānuāriōs iānuāriās iānuāria
ablative iānuāriō iānuāriā iānuāriō iānuāriīs
vocative iānuārie iānuāria iānuārium iānuāriī iānuāriae iānuāria


See also[edit]


  • du Cange, Charles (1883), “ianuarius”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • ianuarius in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • Rome, January 1st: Kalendis Ianuariis Romā (dabam)