Usually means: Quantum mechanics fundamental energy unit.
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We found 22 dictionaries that define the word Planck's constant:

General (14 matching dictionaries)
  1. Planck's constant: Merriam-Webster
  2. Planck's constant: Oxford Learner's Dictionaries
  3. Planck's constant: American Heritage Dictionary of the English Language
  4. Planck's constant, Planck's constant: Collins English Dictionary
  5. Planck's constant: Vocabulary.com
  6. Planck's constant: Wiktionary
  7. Planck's constant: The Wordsmyth English Dictionary-Thesaurus
  8. Planck's constant: Infoplease Dictionary
  9. Planck's constant, plancks constant: Dictionary.com
  10. Planck's constant, Plancks constant: Wikipedia, the Free Encyclopedia
  11. Planck's constant: Rhymezone
  12. plancks constant: FreeDictionary.org
  13. planck's constant: Mnemonic Dictionary
  14. Planck's constant: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Planck's constant: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Planck's constant: Medical dictionary

Science (3 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Planck's Constant: Eric Weisstein's World of Physics
  3. Accelerator Glossary (No longer online)

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (Planck's constant)

noun:  (quantum mechanics) the constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action


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