millionth
n. countable B2 Upper Intermediate US //ˈmɪɫjənθ// UK //mˈɪliənθ// mil·lionth
n. the position of number 1,000,000 in a series. It is the ordinal form of the number one million.
n. the ordinal number corresponding to the cardinal number one million. Often used in technical contexts to describe a specific position in a sequence or a fraction of a million.
He reached the millionth visitor to his website today.
The scientist measured the concentration of the substance down to the millionth of a gram to ensure accuracy.
In a vast database containing billions of records, the millionth entry was flagged for an anomaly that required manual verification by the engineering team.
From million + -th (ordinal suffix).