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thousandth (adj.)

1550s, from thousand + -th (1).

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Definitions of thousandth from WordNet
1
thousandth (n.)
position 1,000 in a countable series of things;
thousandth (n.)
one part in a thousand equal parts;
Synonyms: one-thousandth
2
thousandth (adj.)
the ordinal number of one thousand in counting order;
Synonyms: th
From wordnet.princeton.edu