ppm ppm
parts per million; a measurement showing how much of a particular substance something contains:
• employees exposed to formaldehyde concentrations of 1 ppm or more
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ppm UK US noun [plural] MEASURES
► ABBREVIATION FOR parts per million: the amount of a chemical in relation to the substance that contains it: »
Lead levels in the water were above 3,500 ppm.
Financial and business terms. 2012.