1.(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
2.the number of elements in a mathematical set; denotes a quantity but not the order
3.a variable color averaging a vivid red
4.crested thick-billed North American finch having bright red plumage in the male
5.serving as an essential component;
a cardinal rule
6.being or denoting a numerical quantity but not order;
cardinal numbers