S: (n) cardinal ((Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes)
S: (adj) cardinal, central, fundamental, key, primal (serving as an essential component) "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
S: (adj) cardinal (being or denoting a numerical quantity but not order) "cardinal numbers"