The Vatican is the city state in Rome ruled by the Pope which is the centre of the Roman Catholic Church. You can also use the Vatican to refer to the Pope or his officials.
The President had an audience with the Pope in the Vatican.
Normally the Vatican does not intervene in the internal affairs of religious ordersexcept in cases of disputed elections.
Vatican in British English
(ˈvætɪkən)
noun
1.
a.
the palace of the popes in Rome and their principal residence there since 1377, which includes administrative offices, a library, museum, etc, and is attached to the basilica of St Peter's
b.
(as modifier)
the Vatican Council
2.
a.
the authority of the Pope and the papal curia
b.
(as modifier)
a Vatican edict
Word origin
C16: from Latin Vāticānus mons Vatican hill, on the western bank of the Tiber, of Etruscan origin
Vatican in American English
(ˈvætɪkən)
noun
1.
the papal residence, consisting of a group of buildings in Vatican City
2.
papal government or authority
adjective
3.
of this residence, government, or authority
4.
designating either of the Roman Catholic Ecumenical Councils held in St. Peter's Basilica in 1869-70 (Vatican I) or 1962-65 (Vatican II)