adj · noun · 4 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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/ˈwʌnθ/
rhymes with -ʌnθ
1
adj
Meaning 1
'first', or other ordinal derivatives of 'one', such as hundred-and-oneth or minus-oneth
Definition source: English Wiktionary via Wiktextract
Usage: nonstandard, not-comparable
Examples
Soon after the first law of thermodynamics was postulated in the mid nineteenth century, it was realized how the law presupposed a more elementary law, which we now call the zeroth law ... But scientists soon realized how even the zeroth law was too advanced, since it presupposed a yet more elementary law, which explains why the minus-oneth law had to be formulated. —Paul M. S. Monk, 2008. "Laws and the minus-oneth law of thermodynamics", in Physical chemistry: understanding our chemical world, p. 8.
(see table 9.1 with row numbers four, ten, and sixteen terminating respectively at the eleventh, twenty-ninth and forty-oneth place) —A. R. Rajwade, 2001. Convex polyhedra with regularity conditions and Hilbert's third problem, p. 72.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adj
Meaning 2
Used at the end of algebraic expressions indicating ordinal position that end in 1, such as (k+1)th
Definition source: English Wiktionary via Wiktextract
Usage: nonstandard, not-comparable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
(in compounds with twenty-, thirty-, forty-, etc.) A fractional part of an integer ending in one
Definition source: English Wiktionary via Wiktextract
Usage: nonstandard
Examples
about twenty thirty-oneths in value of such sales being made as hereinafter mentioned to a syndicate of persons in the United Kingdom, about seven thirty-oneths to residents in the United States, and about four thirty-oneths to residents in other European countries and the colonies. —"Brooke & Co. (Limited) v. Commissioners of Inland Revenue". In The Weekly Reporter, vol. XLIV, p. 671, August 15, 1896. Supreme Court of Judicature, House of Lords, London.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
An ordinal value that is represented by an expression ending in 1 such as the (n + 1)th.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
History
Etymology
Etymology tree Proto-Indo-European *ís? Proto-Indo-European *h1óynos Proto-Germanic *ainaz Proto-West Germanic *ain Old English ān Middle English on English one English -th English oneth From one + -th (ordinal suffix).
