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