Definition from Wiktionary, the free dictionary
- (historical) A region of central Italy in which the city of Rome was founded and grew to be the capital city of the Roman Empire
region of central Italy
Probably a loanword from an ancient non-Indo-European language, but it has also been linked to latus (“wide”), a reference to the flat land, or "side", being on the southwest side of the Italian peninsula.
Second declension, with locative.