"thousandth" in the noun sense
1. thousandth
position 1,000 in a countable series of things
2. one-thousandth, thousandth
one part in a thousand equal parts
"thousandth" in the adjective sense
1. thousandth, 1000th
the ordinal number of one thousand in counting order
Source: WordNet® (An amazing lexical database of English)
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