ppm

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Also PPM, P.P.M., p.p.m. parts per million.
pulse per minute.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for ppm

ppm

abbreviation for

chem parts per million
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

Word Origin and History for ppm

abbreviation of parts per million, attested by 1913.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ppm

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.