ordinal number

noun
1.
Also called ordinal numeral. any of the numbers that express degree, quality, or position in a series, as first, second, and third (distinguished from cardinal number ).
2.
Mathematics. a symbol denoting both the cardinal number and the ordering of a given set, being identical for two ordered sets having elements that can be placed into one-to-one correspondence, the correspondence preserving the order of the elements.

Origin:
1600–10

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World English Dictionary
ordinal number
 
n
1.  Sometimes shortened to: ordinal a number denoting relative position in a sequence, such as first, second, third
2.  logic, maths a measure of not only the size of a set but also the order of its elements

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ordinal number   (ôr'dn-əl)  Pronunciation Key 
A number, such as 3rd, 11th, or 412th, used in counting to indicate position in a series but not quantity. Compare cardinal number.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Shows the ordinal number of the current page and the total number of pages in the plot file.
Students may also be asked to determine whether a quantifier should be a cardinal or ordinal number.
Count an ordered set of objects, using the ordinal number words first through twentieth.
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