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cardinal noun

  /ˈkɑɹdnəl/ , /ˈkɑɹdɪnəl/ , /ˈkɑː.dɪ.nəl/ , /ˈkɑːd.nəl/
  • (Roman Catholic) One of the officials appointed by the pope in the Roman Catholic Church, ranking only below the pope and the patriarchs, constituting the special college which elects the pope.
  • Any of various related passerine birds of the family Cardinalidae (See Wikipedia article on cardinals) and other similar birds that were once considered to be related.
 cardinale
  • (math) Short for cardinal number, a number indicating quantity, or the size of a set (e.g., 0, 1, 2, 3). (See Cardinal_number.)
 numero cardinale
  • A deep red color, somewhat less vivid than scarlet, the traditional colour of a Catholic cardinal's cassock. (same as cardinal red)
 rosso cardinale

cardinal adjective

  /ˈkɑɹdnəl/ , /ˈkɑɹdɪnəl/ , /ˈkɑː.dɪ.nəl/ , /ˈkɑːd.nəl/
  • Of fundamental importance; crucial, pivotal.
  • (nautical) Of or relating to the cardinal directions (north, south, east and west).
  • Describing a “natural” number used to indicate quantity (e.g., zero, one, two, three), as opposed to an ordinal number indicating relative position.
  • Having a bright red color (from the color of a Catholic cardinal’s cassock).
 cardinale

cardinality noun

  • (set theory, of a set) The number of elements a given set contains.
 cardinalità, numerosità, potenza
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