ordinal-number

listen to the pronunciation of ordinal-number
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Attributive form of ordinal number, noun
A number used to denote position in a sequence

In the expression a3, the 3 is an ordinal number.

A generalized kind of number to denote the size of a well-ordered set
A word that expresses the relative position of an item in an ordered sequence

First, second and third are the ordinal numbers corresponding to one, two and three.

the number designating place in an ordered sequence
An ordinal number or an ordinal is a word such as `first', `third', and `tenth' that tells you where a particular thing occurs in a sequence of things. Compare cardinal number. A number indicating position in a series or order. The ordinal numbers are first (1st), second (2nd), third (3rd), and so on. one of the numbers such as first, second, third etc which show the order of things cardinal number (ordinalis, from ordo; ORDER)
number which indicates a place in a series (first, second, etc.)