— used to refer to an unknown number in a series of numbers第n个的；第n次的
I told him for the nth time that I would not support him. [=I told him again that I would not support him, as I have told him many times before]我告诉他多少回了，我不会支持他的。
to the nth degree
:extremely:as much as possible极端地；非常；极大程度上地
He is dedicated to the nth degree. [=he is extremely dedicated]他全情投入。