Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: n mathematical sign for a number of unknown value + -th

nth

 adjective
     
nth
1

to the nth degree

informal extremely, or as much as possible:
It was boring to the nth degree.
2 [only before noun] informal the most recent of a long series of similar things that have happened:
Even after I'd reminded him for the nth time, he forgot.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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