Meaning of “millionth” in the English Dictionary

"millionth" in British English

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(Definition of “millionth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"millionth" in American English

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millionthadjective, noun [ C ]

us /ˈmɪl·jənθ/

A millionth is one of a million equal parts of something.

(Definition of “millionth” from the Cambridge Academic Content Dictionary © Cambridge University Press)