nth

adjective

1. being the last in a series of infinitely decreasing or increasing values, amounts, etc.
2. (of an item in a series of occurrences, planned events, things used, etc., that is thought of as being infinitely large) being the latest, or most recent: This is the nth time I’ve told you to eat slowly.

Idioms

3. the nth degree/power,
   1. a high degree or power.
   2. the utmost degree or extent: The new hotel was luxurious to the nth degree.

adjective

1. maths of or representing an unspecified ordinal number, usually the greatest in a series of valuesthe nth power
2. informal being the last, most recent, or most extreme of a long seriesfor the nth time, eat your lunch!
3. to the nth degree informal to the utmost extreme; as much as possible

abbreviation for

1. North

1852, in phrase to the nth, figurative use of a mathematical term indicating indefinite number, in which n is an abbreviation for number (n.). see to the nth degree.