Of fundamental importance; crucial, pivotal. / (nautical) Of or relating to the cardinal directions (north, south, east and west).

(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. (See Wikipedia article on Catholic cardinals.)

(baseball) A player on the St. Louis Cardinals team. / (American football) A player on the Arizona Cardinals team. / A player on a sports team at Stanford University.

(set theory, of a set) The number of elements a given set contains. / (type theory) The number of terms that can inhabit a type; the possible values of a type.

(baseball) The team St. Louis Cardinals. / (American football) The team Arizona Cardinals. / A sports team at the University of Louisville.

plural of Cardinal

plural of cardinal

In a cardinal manner; fundamentally.

plural of cardinality

(economics) to transform an ordinal measure (where distance between points doesn't matter, just the ordering) into a cardinal one (where distance matters). / To exalt to the office of a cardinal.