# 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 of ordinal number

1
First recorded in 1600–10

## Words Nearby ordinal number

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

## 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.

• 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

ordinal number

noun
1. a number denoting relative position in a sequence, such as first, second, third: Sometimes shortened to: ordinal

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 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

ordinal number

[ ôrdn-əl ]

1. A number, such as 3rd, 11th, or 412th, used in counting to indicate position in a series but not quantity. Compare cardinal number.