Definitions from Wiktionary ( )

▸ adjective:  Of fundamental importance; crucial, pivotal.
▸ adjective:  (nautical) Of or relating to the cardinal directions (north, south, east and west).
▸ adjective:  Describing a “natural” number used to indicate quantity (e.g., zero, one, two, three), as opposed to an ordinal number indicating relative position.
▸ adjective:  Having a bright red color (from the color of a Catholic cardinal’s cassock).
▸ adjective:  (astrology) Being one of the signs Aries, Cancer, Libra and Capricorn, associated with initiation, creation, and force.
▸ noun:  (Roman Catholicism) 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.
▸ noun:  Any of various species of New-World passerine songbird in the genus Cardinalis, or in the family Cardinalidae more generally, or of similar appearance and once considered to be related to the former; so called because of their red plumage. (See Wikipedia article for taxonomical information.)
▸ noun:  A deep red color, somewhat less vivid than scarlet, the traditional colour of a Catholic cardinal's cassock. (same as cardinal red)
▸ noun:  (now historical) A woman's short cloak with a hood, originally made of scarlet cloth.
▸ noun:  (obsolete) Mulled red wine.
▸ noun:  (baseball) A player on the St. Louis Cardinals team.
▸ noun:  (American football) A player on the Arizona Cardinals team.
▸ noun:  A student or player on a sports team at the University of Louisville.
▸ noun:  A player on a sports team at Stanford University.
▸ noun:  A surname from French common among French Canadians as well as Cree and Métis indigenous peoples in Canada.
▸ noun:  (mathematics) Short for cardinal number, a number indicating quantity, or the size of a set (e.g., 0, 1, 2, 3). (See Cardinal_number.) [A number used to denote quantity; a counting number; a cardinal.]
▸ noun:  (grammar) Short for cardinal numeral, a word used to represent a cardinal number. [(grammar) A word used to represent a cardinal number.]
▸ noun:  Short for cardinal flower (Lobelia cardinalis), a flowering plant. [Lobelia cardinalis (syn. L. fulgens), a species of lobelia native to the Americas, usually with vibrant red flowers.]
▸ noun:  Short for cardinal tetra (Paracheirodon axelrodi), a freshwater fish. [A freshwater fish (Paracheirodon axelrodi, family Characidae), native to rivers in South America, popular as an aquarium fish.]

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