Ppm
1.
Also, PPM, P.P.M. p.p.m. parts per million.
2.
pulse per minute.
abbreviation
1.
(chem) parts per million
2.
Also PPM. peak programme meter
noun
See part per million
abbreviation of parts per million, attested by 1913.
ppm abbr.
parts per million
Portable Pixmap
1.
page per minute
2.
parts per million
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