The AI-powered English dictionary
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(nonstandard) 'first', or other ordinal derivatives of 'one', such as hundred-and-oneth or minus-oneth
(nonstandard) Used at the end of algebraic expressions indicating ordinal position that end in 1, such as (k+1)th quotations
About once a year, and generally after the six o'clock news (query for B.B.C. experts — is the six o'clock public more gullible?) a Very Big Noise has reported that, after the n — nth or n — plus — oneth year of the war, the health of the nation is yet again better than ever.
1945, Feed & Farm Supplies - Volume 31, page 240
The attempts, to a mathematician at any rate, are less comprehensible than the n plus oneth dimension, where n is any integer you please.
1945, Eric Temple Bell, Numerology: The Magic of Numbers, page 99
If the billionth dog in the line is a Saint Bernard, then the last (billion-plus-oneth) dog in the line is a Saint Bernard.
2008, Steven D. Hales, What Philosophy Can Tell You about Your Dog, page 187
plural oneths
(nonstandard) (in compounds with twenty-, thirty-, forty-, etc.) A fractional part of an integer ending in one
(in algebraic expressions) An ordinal value that is represented by an expression ending in 1 such as the (n + 1)th. quotations examples
And then it was found that Dr. Whewell, or, as others asserted, one Dr. Donaldson, of Cambridge, had already responded to a similar challenge with an anticipatory variation of the idea : Youths who would senior wranglers be Must drink the juice distilled from tea, Must burn the midnight oil from month to month, Raising binomials to the n + 1th (n plus oneth).
1892, William S. Walsh, Handy-Book of Literary Curiosities, page 970