From Proto-Italic *atnos, from Proto-Indo-European *h₂et-no-, probably from *h₂et- ‎(to go). Cognate with Oscan akno- ‎(year, holiday, time of offering), Gothic 𐌰𐌸𐌽 ‎(aþn, year), dialectal Dutch aden ‎(year). For the root, compare Sanskrit अतति ‎(atati, he wanders, goes).



annus m ‎(genitive annī); second declension

  1. year
    Viginti annos natus est.
    He is twenty years old.
    Abhinc duo annos factum est.
    It happened two years ago.
  2. time; season

Usage notesEdit

  • In Ancient Rome, the word annus originally meant "ten months" which was the duration of the Roman year (from the month martius to december 304 days, with the remaining two months of winter not assigned to a specific month). This later came to mean "twelve months" as the calendar was rearranged by Julius Caesar and the month of July named after him.


Second declension.

Number Singular Plural
nominative annus annī
genitive annī annōrum
dative annō annīs
accusative annum annōs
ablative annō annīs
vocative anne annī

Derived termsEdit


External linksEdit

  • annus” in Charlton T. Lewis & Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879.
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