Definitions from Wiktionary (cardinal number)

▸ noun:  A number used to denote quantity; a counting number; a cardinal.
▸ noun:  (mathematics) A generalized kind of number used to denote the size of a set, including infinite sets.
▸ noun:  (grammar) A word that expresses a countable quantity; a cardinal numeral.
▸ Also see cardinal_number



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