Nth \ENTH\ 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.
Origin: Nth is the figurative use of the mathematical term indication indefinite number, in which n is an abbreviation for number.