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ppm

1.
Also, PPM, P.P.M. p.p.m. parts per million.
2.
pulse per minute.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for ppm

ppm

abbreviation
1.
(chem) parts per million
2.
Also PPM. peak programme meter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for ppm
noun
Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Word Origin and History for ppm

abbreviation of parts per million, attested by 1913.

Online Etymology Dictionary, © 2010 Douglas Harper
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ppm in Medicine

ppm abbr.
parts per million

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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