Usually means: Energy needed to initiate reaction.
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We found 21 dictionaries that define the word activation energy:

General (11 matching dictionaries)
  1. activation energy: Merriam-Webster
  2. activation energy: Oxford Learner's Dictionaries
  3. activation energy: Vocabulary.com
  4. activation energy: Wiktionary
  5. activation energy: Dictionary.com
  6. Activation energy: Wikipedia, the Free Encyclopedia
  7. activation energy: Rhymezone
  8. activation energy: FreeDictionary.org
  9. activation energy: Mnemonic Dictionary
  10. activation energy: TheFreeDictionary.com
  11. activation energy: Merriam-Webster

Computing (1 matching dictionary)
  1. activation energy: Encyclopedia

Medicine (4 matching dictionaries)
  1. activation energy: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. General Glossary (No longer online)
  4. activation energy: Medical dictionary

Science (3 matching dictionaries)
  1. Chemistry Dictionary (No longer online)
  2. Activation Energy: Eric Weisstein's World of Chemistry
  3. activation energy: PHYSICAL ORGANIC CHEMISTRY

Slang (1 matching dictionary)
  1. Activation Energy: Urban Dictionary

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (activation energy)

noun:  (physical chemistry, physics) The energy required to initiate a reaction. For example, the flame from the fuse of a firecracker provides a small initial amount of energy, after which the explosive reaction proceeds by itself, releasing a considerably larger quantity of energy. A small push given to a stable but top-heavy object may cause it to fall over; the potential energy released during the fall was present in the system all along but could not be realized as long as the object was upright and balanced.

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