LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Vātī̆cānus1

Vātī̆cānus m (genitive Vātī̆cānī)
Classical[waː.tiːˈkaː.nʊs]Ecclesiastical[va.tiˈkaː.nus]

Meaning

  1. the Vatican (a hill in Rome, Italy)
  2. Vatican City (the small state forming the headquarters of the Roman Catholic Church)
  3. the papacy (the government of the state and Catholic Church)
  4. Romanalternativealternative form of Vagitanus

Declension

declension
formsingularplural
nominativeVātī̆cānus—
genitiveVātī̆cānī—
dativeVātī̆cānō—
accusativeVātī̆cānum—
ablativeVātī̆cānō—
vocativeVātī̆cāne—

Vātī^cānus (
I. i short, Hor. C. 1, 20, 7, but lengthened in Juv. and Mart.), a, um, adj. (sc. mons, collis), the Vatican Hill in Rome, on the western bank of the Tiber, Hor. C. 1, 20, 7; Juv. 6, 344; Fest. p. 379 Müll.; cf. Becker, Antiq. 1, p. 659 sq.; also plur., for the hill and the space around it: montes Vaticani, Cic. Att. 13, 33, 4: campus, id. ib.: ager, id. Agr. 2, 35, 96: vallis, between the Vatican and the Janiculum, Tac. A. 4, 14: Circus, Plin. 16, 40, 76, § 201: Vaticana (sc. vina), Vatican wine (a very inferior sort), Mart. 6, 92, 3; 10, 45, 5; cf. cadus, id. 1, 19, 2; 12, 48, 14.—Subst.: in Vaticano, Plin. 8, 14, 14, § 37; 16, 44, 87, § 237; 18, 3, 4, § 20: Vaticanus, the divinity presiding over the Vatican, Varr. ap. Gell. 16, 17, 2; Aug. Civ. Dei, 4, 8, 12.

Origins

Unknown. The connection to vāticinor (“to prophesy”) is folk-etymological.

In the Academy Smith's classical dictionaries

Biography & mythologyVaticanusVaticanus. an agnomen of T. Romilius Rocus, consul B. C. 455, and a member of the first decemvirate [ROMILIUS], and also of P. Sextius Capitolinus, co…
adjectivefirst/second-declension adjective
vātī̆cānus2
vātī̆cānus (feminine vātī̆cāna, neuter vātī̆cānum)
Classical[waː.tiːˈkaː.nʊs]Ecclesiastical[va.tiˈkaː.nus]

Meaning

  1. adjectiveVatican, of or relating to the Vatican in its various senses

Declension

singular
formmasculinefeminineneuter
nominativevātī̆cānusvātī̆cānavātī̆cānum
genitivevātī̆cānīvātī̆cānaevātī̆cānī
dativevātī̆cānōvātī̆cānaevātī̆cānō
accusativevātī̆cānumvātī̆cānamvātī̆cānum
ablativevātī̆cānōvātī̆cānāvātī̆cānō
vocativevātī̆cānevātī̆cānavātī̆cānum
plural
formmasculinefeminineneuter
nominativevātī̆cānīvātī̆cānaevātī̆cāna
genitivevātī̆cānōrumvātī̆cānārumvātī̆cānōrum
dativevātī̆cānīsvātī̆cānīsvātī̆cānīs
accusativevātī̆cānōsvātī̆cānāsvātī̆cāna
ablativevātī̆cānīsvātī̆cānīsvātī̆cānīs
vocativevātī̆cānīvātī̆cānaevātī̆cāna

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

Vāticānus (Vātī-, Iu.), adj.,
Vatican, of the Vatican Hill: montes: campus, C.: mons, H., Iu.

Origins

From vāticinor (“to prophesy”).

Quick answers

What does Vātī̆cānus mean in Latin?
Vātī̆cānus, a proper noun, means “the Vatican (a hill in Rome, Italy); Vatican City (the small state forming the headquarters of the Roman Catholic Church); the papacy (the government of the state and Catholic Church)”.
What is the genitive of Vātī̆cānus?
The genitive singular is Vātī̆cānī. Vātī̆cānus is masculine, second declension.
How do you pronounce Vātī̆cānus?
In classical Latin, [waː.tiːˈkaː.nʊs]; in ecclesiastical (church) Latin, [va.tiˈkaː.nus].