Each of two general councils of the Roman Catholic Church, held in 1869–70 and 1962–5. The first (Vatican I) proclaimed the infallibility of the Pope when speaking ex cathedra; the second (Vatican II) made numerous reforms, abandoning the universal Latin liturgy and acknowledging ecumenism.
Definition of Vatican Council in US English:
Vatican Council
nounˈvadəkən ˈkounsəl
Each of two general councils of the Roman Catholic Church, held in 1869–70 and 1962–65. The first (Vatican I) proclaimed the infallibility of the Pope when speaking ex cathedra; the second (Vatican II) made numerous reforms, abandoning the universal Latin liturgy and acknowledging ecumenism.