Prefix used in the SI and metric system to signify submultiples of one-thousandth (10−3). [L. mille, one thousand]
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prefix denoting
one thousandth part.
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[L. mille thousand] a prefix indicating one thousand (e.g., millipede); also used in naming units of measurement (symbol m) to indicate one thousandth (10−3) of the unit designated by the root with which it is combined.Medical dictionary. 2011.