Cardinal versus ordinal numbers
Cardinal one two three four
1 2 3 4
Ordinal first second third fourth
1st 2nd 3rd 4th

In linguistics, ordinal numerals or ordinal number words are words representing position or rank in a sequential order; the order may be of size, importance, chronology, and so on (e.g., "third", "tertiary"). They differ from cardinal numerals, which represent quantity (e.g., "three") and other types of numerals.

In traditional grammar, all numerals, including ordinal numerals, are grouped into a separate part of speech (Latin: nomen numerale, hence, "noun numeral" in older English grammar books). However, in modern interpretations of English grammar, ordinal numerals are usually conflated with adjectives.

Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced. For example: 5 November 1605 (pronounced "the fifth of November ... "); November 5, 1605, ("November (the) Fifth ..."). When written out in full with "of", however, the suffix is retained: the 5th of November. In other languages, different ordinal indicators are used to write ordinal numbers.

In American Sign Language, the ordinal numbers first through ninth are formed with handshapes similar to those for the corresponding cardinal numbers with the addition of a small twist of the wrist.[1]



In English, the main ordinal series is 'first', 'second', .... It is used in a variety of rankings, including time ('the first hour of the event'), space ('the first left'), and quality ('first class cabin').

The Latinate series 'primary', 'secondary', ... is often used for importance or precedence ('primary consideration') and sequence of dependence ('secondary effect', 'secondary boycott', 'secondary industry'), though there are other uses as well ('primary school', 'primary election').[2] The first two in the sequence are by far the most common; 'tertiary' appears occasionally, and higher numbers are rare except in specialized contexts ('quaternary period').

The Greek series proto-, deutero-, trito-, ... is only found in prefixes, generally scholarly and technical coinages, e.g. protagonist, deuteragonist, tritagonist; protium, deuterium, tritium; Proto-Isaiah, Deutero-Isaiah.[3] Numbers beyond three are rare; those beyond four are obscure.

The first twelve variations of ordinal numbers are given here.

Spatial or chronological Precedence or effect Greek prefix
first primary proto-
second secondary deutero-
third tertiary trito-
fourth quaternary, quartary tetarto-
fifth quinary (pempto-)
sixth senary (ecto-, hecto-)
seventh septenary (ebdomo-, hebdomo-)
eighth octonary (ogdo-)
ninth nonary (enato-)
tenth decenary[4] (decato-)
eleventh undenary (endecato-)
twelfth duodenary (dodecato-)

The spatial and chronological ordinal numbers corresponding to cardinals from 13 to 19 are the number followed by the suffix -th, as "sixteenth". For multiples of ten, the same principle applies, with terminal -y changed to -ieth, as "sixtieth". For other numbers, the elements of the cardinal number are used, with the last word replaced by the ordinal: 23 → "twenty-third"; 523 → "five hundred twenty-third" (British English: "five hundred and twenty-third").

When speaking the numbers in fractions, the spatial/chronological numbering system is used for denominators larger than 2 (2 as the denominator of a fraction is "half" rather than "second"), with a denominator of 4 sometimes spoken as "quarter" rather than "fourth". This system results in "two thirds" for 23 and "fifteen thirty-seconds" for 1532. This system is normally used for denominators less than 100 and for many powers of 10. Examples include "six ten-thousandths" for 610,000 and "three hundredths" for 0.03.



In Chinese, ordinal numbers are formed by adding 第 (pinyin: dì, Jyutping: dai6) before the cardinal numbers.

Cardinal Ordinal
1st 第一
2nd 第二
3rd 第三
4th 第四
5th 第五
10th 第十
72nd 七十二 第七十二
100th 一百 第一百

See also



  1. ^ ""numbers" ASL American Sign Language". Archived from the original on 2021-11-17. Retrieved 2009-11-03.
  2. ^ "Ordinal Numbers Revisited". Archived from the original on 2012-04-22. Retrieved 2011-11-26.
  3. ^ N. Cloet (1852). De la restauration du Chant Liturgique. Plancy: Société de Saint-Victor pour la propagation des bons livres. Archived from the original on 2017-06-26. Retrieved 2011-11-26.
  4. ^ "DECENARY | Meaning & Definition for UK English |". Lexico Dictionaries | English (3rd ed.). Oxford: Oxford University Press. 2015. Archived from the original on 2018-02-12. Retrieved 2021-12-07.