The Collaborative International Dictionary of English v.0.48:
Vatican Council \Vat"i*can Coun"cil\ (R. C. Ch.) The council held under Pope Pius IX. in Vatican at Rome, in 1870, which promulgated the dogma of papal infallibility. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
Vatican Council n 1: each of two councils of the Roman Catholic Church