/enth/ , adj.
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.
3. the nth degree or power ,
a. a high degree or power.
b. the utmost degree or extent: The new hotel was luxurious to the nth degree.
[ 1850-55; N (symbol, def. 5) + -TH 2 ]