cardinal number

noun

1. A number used to denote quantity; a counting number; a cardinal.“The cardinal number "three" can be represented as "3" or "three".”
2. A generalized kind of number used to denote the size of a set, including infinite sets.
3. (grammar) A word that expresses a countable quantity; a cardinal numeral.“"Three" is a cardinal number, while "third" is an ordinal number.”