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 (synset 109913595)
  2. The number of elements in a mathematical set;
    Denotes a quantity but not the order (synset 113618828)
  3. A variable color averaging a vivid red (synset 104970626)
  4. Crested thick-billed North American finch having bright red plumage in the male (synset 101544027)
  1. Serving as an essential component (synset 301280207)
    "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
  2. Being or denoting a numerical quantity but not order (synset 302191250)
    "cardinal numbers"

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