nth
adjective [ before noun ] informal uk/enθ/ us/enθ/
（经过无数次后）又一次的，第
used to describe the most recent in a long series of things, when you do not know how many there are
I glanced at my watch for the nth time that morning. 那天早晨我看了无数次表。
Idiom
to the nth degreeidiom 极度;无穷
as much or as far as possible
We were questioned to the nth degree. 我们被仔仔细细盘问了无数遍。