ordinal numeral

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ordinal numeral is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
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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