(noun.) crested thick-billed North American finch having bright red plumage in the male.
(noun.) a variable color averaging a vivid red.
(noun.) (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.
(adj.) 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' .
(adj.) being or denoting a numerical quantity but not order; 'cardinal numbers' .
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