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