- Vatican [vat′i kən]n.[L Vaticanus (mons), Vatican (hill)]1. the papal residence, consisting of a group of buildings in Vatican City2. papal government or authorityadj.1. of this residence, government, or authority2. designating either of the Roman Catholic Ecumenical Councils held in St. Peter's Basilica in 1869-70 (Vatican I) or 1962-65 (Vatican II)
English World dictionary. V. Neufeldt. 2014.