ordinal number
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ordinal number
noun ordinal numbers
- A word that expresses the relative position of an item in a sequence. First, second and third are the ordinal numbers corresponding to one, two and three.
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A natural number used to denote position in a sequence.
In the expression a₃, the "3" is an ordinal number.
Similar: ordinal, ordinal numeral
- Such a number generalised to correspond to any cardinal number (the size of some set); formally, the order type of some well-ordered set of some cardinality a, which represents an equivalence class of well-ordered sets (exactly those of cardinality a) under the equivalence relation "existence of an order-preserving bijection". 1950, Frederick Bagemihl (translator), Erich Kamke, Theory of Sets, Dover (Dover Phoenix), 2006, page 137, For not only do the antinomies a) to e) disappear when we admit as elements of sets only such sets, ordinal numbers, and cardinal numbers as are bounded above by a fixed cardinal number, but we
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noun generalized kind of number to denote the length of a well-order on a set
| 日本語 | 順序数 junjosū |
|---|
noun grammar: word used to denote relative position in a sequence
| 한국어 | 서수 seosu, 서수사 seosusa |
|---|---|
| 日本語 | 序数詞 josūshi, 序数 josū |
| 中文 | 順序數 /顺序数 shùnxùshù, 序數 /序数 xùshù, 序數詞 /序数词 xùshùcí |
| हिन्दी | कर्मवाचक संख्या karmvācak saṅkhyā |
| Português | número ordinal |
| Français | nombre ordinal (pl. nombres ordinaux) |
| Deutsch | Ordnungszahl, Ordnungszahlwort, Ordinale, Ordinalzahl |
| Ελληνικά | τακτικό αριθμητικό taktikó arithmitikó |
| Русский | поря́дковое числи́тельное porjádkovoje čislítelʹnoje |
noun arithmetic: number used to denote position in a sequence
| 中文 | 序數 /序数 xùshù |
|---|---|
| Русский | поря́дковый но́мер porjádkovyj nómer, но́мер nómer |
Talk about this word "ordinal number." Wiktionary, via Micwyn, micwyn.com/word/ordinal%20number. Accessed 6 Nov. 2026. ordinal number. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/ordinal%20number "ordinal number." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/ordinal%20number.Cite this
@misc{ordinal_number_2026,
title = {ordinal number},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/ordinal%20number},
urldate = {2026-11-06}
}
