[determiner], [noun] [C], [pronoun]Coventry City football club counted their millionth supporter through the gates last Saturday.(informal) They're showing the film 'High Noon' tonight for the millionth time (= having already shown it a lot of times).Miraculously, the whole process only takes a millionth (= one of a million equal parts) of a second.
MILLIONTH
Meaning of MILLIONTH in English
Cambridge English vocab. Кембриджский английский словарь. 2012