Usually means: Standard Temperature and Pressure conditions.
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We found 49 dictionaries that define the word STP:

General (18 matching dictionaries)
  1. STP, STP: Merriam-Webster
  2. STP: Oxford Learner's Dictionaries
  3. STP: American Heritage Dictionary of the English Language
  4. STP: Collins English Dictionary
  5. STP, s.t.p: Vocabulary.com
  6. Stp, stp: Wordnik
  7. STP: Webster's New World College Dictionary, 4th Ed.
  8. STP: Infoplease Dictionary
  9. StP, s.t.p: Dictionary.com
  10. S.T.P: Online Etymology Dictionary
  11. STP (disambiguation), STP (file format), STP (motor oil company), STP, Stp: Wikipedia, the Free Encyclopedia
  12. S.t.p, Stp: Rhymezone
  13. STP: Stammtisch Beau Fleuve Acronyms
  14. S.T.P: Dictionary of Phrase and Fable (1898)
  15. s.t.p, stp: FreeDictionary.org
  16. s.t.p, stp: Mnemonic Dictionary
  17. STP, s.t.p: TheFreeDictionary.com
  18. STP: Wiktionary

Business (4 matching dictionaries)
  1. Travel Industry Dictionary (No longer online)
  2. STP: Investopedia
  3. Comprehensive Financial (No longer online)
  4. BusinessDictionary.com (No longer online)

Computing (7 matching dictionaries)
  1. STP, StP: Free On-line Dictionary of Computing
  2. STP: CCI Computer
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. STP: Computer Telephony & Electronics Dictionary and Glossary
  5. Webopedia (No longer online)
  6. I T Glossary (No longer online)
  7. STP, s.t.p: Encyclopedia

Medicine (4 matching dictionaries)
  1. STP: Merriam-Webster Medical Dictionary
  2. STP (2,5-dimethoxy-4-methylamphetamine): Merck Manuals
  3. online medical dictionary (No longer online)
  4. STP: Medical dictionary

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

Science (5 matching dictionaries)
  1. STP: Eric Weisstein's World of Physics
  2. STP: Material Safety Data Sheets HyperGlossary
  3. STP: Extragalactic Astronomy
  4. General Chemistry Online (No longer online)
  5. STP: UNCChem Glossary

Slang (2 matching dictionaries)
  1. STP: Street Terms: Drugs and the Drug Trade
  2. S.T.P. (Sexually Transmitted Psychosis), s.t.p, stp: Urban Dictionary

Tech (7 matching dictionaries)
  1. STP: Webster's New World Telecom Dictionary
  2. AUTOMOTIVE TERMS (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. Glossary of Meteorology (No longer online)
  5. Explosives (No longer online)
  6. Rane Professional Audio Reference (No longer online)
  7. STP: Web Hosting Glossary

(Note: See stps as well.)

Definitions from Wiktionary (STP)

noun:  (uncountable, slang) A hallucinogen (2,5-dimethoxy-4-methylamphetamine), chemically related to amphetamine but with LSD-like effects.
noun:  (music) Stone Temple Pilots, an American rock band.
noun:  Initialism of sewage treatment plant.
noun:  (physics, chemistry) Initialism of standard temperature and pressure. [(physics, chemistry) The international, standard conditions used to aid reproducibility; a temperature of 0 °C (273.15 K) and a pressure of 1 atmosphere (101.325 kPa). Abbreviated as STP. Often elliptically called standard conditions.]
noun:  (networking) Initialism of spanning tree protocol.
noun:  (electronics) Initialism of shielded twisted pair. [(electronics) A pair of twisted wires which is surrounded by a metal shield in order to protect from EMI.]
noun:  (especially LGBTQ) Initialism of stand-to-pee. [A device that enables a person with a vagina to more easily urinate while standing.]
adjective:  (construction) Initialism of subject to planning.

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