Usually means: Parts per million concentration measure.
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We found 48 dictionaries that define the word ppm:

General (14 matching dictionaries)
  1. ppm: Longman Dictionary of Contemporary English
  2. ppm: Merriam-Webster
  3. ppm: Oxford Learner's Dictionaries
  4. ppm: American Heritage Dictionary of the English Language
  5. ppm: Collins English Dictionary
  6. ppm: Wordnik
  7. PPM, ppm: Wiktionary
  8. ppm: Webster's New World College Dictionary, 4th Ed.
  9. ppm: The Wordsmyth English Dictionary-Thesaurus
  10. ppm: Infoplease Dictionary
  11. p.p.m, ppm: Dictionary.com
  12. PPM, Ppm, .ppm: Wikipedia, the Free Encyclopedia
  13. PPM: Stammtisch Beau Fleuve Acronyms
  14. ppm: TheFreeDictionary.com

Art (2 matching dictionaries)
  1. Technical Glossary of Theatre Terms (No longer online)
  2. Glossary of Stamp Collecting Terms (No longer online)

Business (2 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. Glossary of Crop Abbreviations (No longer online)

Computing (7 matching dictionaries)
  1. PPM: Free On-line Dictionary of Computing
  2. ppm: CCI Computer
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. PPM: Tech Terms Computer Dictionary
  5. Webopedia (No longer online)
  6. I T Glossary (No longer online)
  7. PPM: Encyclopedia

Medicine (6 matching dictionaries)
  1. ppm: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. GASTROLAB Digestive Dictionary (No longer online)
  5. Hepatitis C Information Central (No longer online)
  6. ppm: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. PPM: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (4 matching dictionaries)
  1. PPM: Material Safety Data Sheets HyperGlossary
  2. ppm: Extragalactic Astronomy
  3. Fishkeeping glossary (No longer online)
  4. ppm: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (1 matching dictionary)
  1. P.P.M, PPM, ppm: Urban Dictionary

Tech (10 matching dictionaries)
  1. PPM: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. AUTOMOTIVE TERMS (No longer online)
  3. Google, News, Images, Wikipedia, Reddit, BlueSky
Definitions from Wiktionary (PPM)

noun:  (initialism) (common) Parts per million. (10000 ppm = 1%)
noun:  (initialism) page(s) per minute
noun:  Initialism of pulse position modulation.
noun:  Initialism of process production model.
noun:  Initialism of power-performance management.
noun:  Initialism of prediction by partial match.
noun:  Initialism of page per minute.

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