Definition of “thousandth” - English Dictionary

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

“thousandth” in American English

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thousandthadjective, adverb, noun [ C ]

us /ˈθɑʊ·zənθ/

(in the position of) the number 1000 in a series; 1000th:

You are our one thousandth customer.

A thousandth is one of a thousand equal parts of something.

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