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- DictionaryCar·di·nal num·ber/ˌkärdənəl ˈnəmbər/
noun
- 1. a number denoting quantity (one, two, three, etc.), as opposed to an ordinal number (first, second, third, etc.).
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In mathematics, a cardinal number, or cardinal for short, is what is commonly called the number of elements of a set. In the case of a finite set, its cardinal number, or cardinality is therefore a natural number. For dealing with the case of infinite sets, the infinite cardinal numbers have been introduced, which are often denoted with the Hebrew letter (aleph) marked with subscript indicating th... Wikipedia