adj
thousandth
THOW-zuhnth
adj
1
Coming after the nine hundred and ninety-ninth in a sequence; the ordinal form of one thousand.
"She was the thousandth customer to enter the new store."
noun
1
One of a thousand equal parts of something.
"The measurement was accurate to a thousandth of a millimeter."
How to Use Thousandth
Learner’s notesIn plain EnglishEither the 1,000th item in a sequence, or one part out of a thousand equal parts.
Common pairings
a thousandth of
the thousandth time
Word Forms
thousandths plural
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Etymology
From thousand plus the ordinal suffix -th.