ordinal number ( synonym found)
Definition of ordinal number:

(n) : a number used to denote position in a sequence; a generalized kind of number to denote the size of a well-ordered set
"Third" is an ordinal number, while "three" is a cardinal number.
Definition of ordinal number:

(n) : a number used to denote position in a sequence; a generalized kind of number to denote the size of a well-ordered set
"Third" is an ordinal number, while "three" is a cardinal number.
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