Usually means: Discrete, fundamental unit of energy.
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We found 48 dictionaries that define the word quantum:

General (26 matching dictionaries)
  1. quantum: Merriam-Webster.com
  2. quantum: Oxford Learner's Dictionaries
  3. quantum: American Heritage Dictionary of the English Language
  4. quantum: Collins English Dictionary
  5. quantum: Vocabulary.com
  6. Quantum, quantum: Wordnik
  7. quantum: Cambridge Advanced Learner's Dictionary
  8. quantum: Wiktionary
  9. quantum: Webster's New World College Dictionary, 4th Ed.
  10. quantum: The Wordsmyth English Dictionary-Thesaurus
  11. quantum: Infoplease Dictionary
  12. quantum: Dictionary.com
  13. quantum: Online Etymology Dictionary
  14. quantum: Cambridge Essential American English Dictionary
  15. Quantum (James Bond), Quantum (Mozilla), Quantum (album), Quantum (book), Quantum (comics), Quantum (disambiguation), Quantum (journal), Quantum (physics), Quantum (software), Quantum (video game), Quantum: Wikipedia, the Free Encyclopedia
  16. Quantum: Online Plain Text English Dictionary
  17. quantum: Webster's Revised Unabridged, 1913 Edition
  18. quantum: Rhymezone
  19. Quantum: AllWords.com Multi-Lingual Dictionary
  20. quantum: Webster's 1828 Dictionary
  21. quantum: Free Dictionary
  22. quantum: Mnemonic Dictionary
  23. quantum: Dictionary/thesaurus
  24. Quantum: World Wide Words

Business (5 matching dictionaries)
  1. quantum: Webster's New World Law Dictionary
  2. Duhaime's Canadian law dictionary (No longer online)
  3. International Law Dictionary (No longer online)
  4. Quantum: INSOLVENCY
  5. Quantum (physics), quantum: Legal dictionary

Computing (3 matching dictionaries)
  1. quantum: Free On-line Dictionary of Computing
  2. Quantum: Computer Telephony & Electronics Dictionary and Glossary
  3. Quantum (physics), quantum: Encyclopedia

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Quantum (physics), quantum: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. quantum: Idioms

Science (6 matching dictionaries)
  1. Quantum: Extragalactic Astronomy
  2. General Chemistry Online (No longer online)
  3. quantum: UNCChem Glossary
  4. Accelerator Glossary (No longer online)
  5. How Many? A Dictionary of Units of Measurement (No longer online)
  6. QUANTUM: Zoom Astronomy Glossary

Slang (2 matching dictionaries)
  1. quantum: Green’s Dictionary of Slang
  2. Quantum: Urban Dictionary

Tech (2 matching dictionaries)
  1. quantum: Webster's New World Telecom Dictionary
  2. Mower Terms (No longer online)

(Note: See quanta as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (now chiefly South Asia or law) The total amount of something; quantity.
noun:  (law) The amount of compensation awarded to a successful party in a lawsuit.
noun:  (law) The length or magnitude of the sentence handed down to someone who has been found guilty of a crime.
noun:  The amount or quantity observably present, or available.
noun:  (physics) The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.
noun:  (computing) The amount of time allocated for a thread to perform its work in a multithreaded environment.
noun:  (medicine) The minimum dose of a pathogen required to cause an infection.
noun:  (mathematics) A definite portion of a manifoldness, limited by a mark or by a boundary.
adjective:  Of a change, sudden or discrete, without intermediate stages.
adjective:  (informal) Of a change, significant.
adjective:  (physics) Involving quanta, quantum mechanics or other aspects of quantum physics.
adjective:  (computing theory) Relating to a quantum computer.
noun:  (computing, uncountable) Short for quantum computing. [(computing) The use of quantum mechanical phenomena to transcend classical time complexity limitations in computing.]

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