adjective
nth
ENTH/enθ/
Occupying an unspecified numbered position in a sequence.
The formula gives the value of the nth term.

Etymology
The n stands for an unspecified whole number, while -th makes it an ordinal. Outside mathematics, that unspecified position or degree can suggest an extreme limit, as in “to the nth degree.”
In context
take take take. And when I used to go into a negotiation, I wanted to negotiate to the nth degree to win.
More examples
- The program retrieves the nth item from the list.
- The nth row contains n dots.
- To find the nth term, replace n with the position number.