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).
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.
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How to use ordinal number in a sentence
The first column of each page contains the ordinal number of the disturbance for purposes of reference.Catalogue of Violent and Destructive Earthquakes in the Philippines | Miguel Saderra Mas
The Latin language often employed the ordinal number instead of the cardinal number.History of Julius Caesar Vol. 2 of 2 | Napoleon III, Emperor of the French, 1808-1873.
Let P be the ordinal number of one of these rings, for example the first counting from the centre.
Eight′fold, eight times any quantity; Eighth, the ordinal number corresponding to eight.
Eight′ieth, the ordinal number corresponding to eighty; Eight′y, eight times ten, fourscore.
British Dictionary definitions for ordinal number
a number denoting relative position in a sequence, such as first, second, third: Sometimes shortened to: ordinal
logic maths a measure of not only the size of a set but also the order of its elements
- Compare cardinal number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for ordinal number
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.