Definition of cardinal

  1. cardinal Adjective Of fundamental importance; crucial, pivotal.
  2. cardinal Adjective Of or relating to the "cardinal" directions (north, south, east and west).
  3. cardinal Adjective Describing a "natural" number used to indicate quantity (e.g., one, two, three), as opposed to an ordinal number indicating relative position.
  4. cardinal Adjective Having a bright red color (from the color of a Catholic cardinal's cassock).
  5. cardinal Noun A number indicating quantity, or the size of a set, e.g., one, two, three. (See Wikipedia article on Cardinal number.)
  6. cardinal Noun An official in the Catholic Church, ranking only below the Pope and the patriarchs. (See Wikipedia article on Catholic cardinals.)
  7. cardinal Noun A songbird of the finch family, "Cardinalis cardinalis".
  8. cardinal Noun Any of various related passerine birds of the family "Cardinalidae". (See Wikipedia article on cardinal birds.)
  9. cardinal Noun A shade of scarlet associated with the colour of a Catholic cardinal's cassock.
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