RhymeZone: cardinal definitions

Definitions of cardinal:

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
noun: the number of elements in a mathematical set; denotes a quantity but not the order
adjective: serving as an essential component
Example: "A cardinal rule"
adjective: being or denoting a numerical quantity but not order
Example: "Cardinal numbers"
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #7622)