1. • 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
   • noun - a variable color averaging a vivid red
   • noun - crested thick-billed North American finch having bright red plumage in the male
   • adj - serving as an essential component
   • adj - being or denoting a numerical quantity but not order
2. • Of foremost importance; paramount: a cardinal rule; cardinal sins.
   • Dark to deep or vivid red.
   • A high church official, ranking just below the pope, who has been appointed by a pope to membership in the College of Cardinals.
   • A dark to deep or vivid red.
   • A North American finch (Cardinalis cardinalis) having a crested head, a short, thick bill, and bright red plumage in the male.
   • A short, hooded cloak, originally of scarlet cloth, worn by women in the 18th century.
   • A cardinal number.
3. • n - a bright red bird

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