Usually means: Initiation or increase of function.
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We found 28 dictionaries that define the word activation:

General (16 matching dictionaries)
  1. activation: Merriam-Webster
  2. activation: Oxford Learner's Dictionaries
  3. activation: Collins English Dictionary
  4. activation: Vocabulary.com
  5. Activation, activation: Wordnik
  6. activation: Cambridge Advanced Learner's Dictionary
  7. activation: Wiktionary
  8. activation: Dictionary.com
  9. activation: Cambridge Essential American English Dictionary
  10. Activation: Wikipedia, the Free Encyclopedia
  11. activation: Rhymezone
  12. activation: FreeDictionary.org
  13. activation: Mnemonic Dictionary
  14. activation: TheFreeDictionary.com

Business (1 matching dictionary)
  1. activation: Legal dictionary

Computing (1 matching dictionary)
  1. activation: Encyclopedia

Medicine (4 matching dictionaries)
  1. activation: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. activation: Medical dictionary

Religion (1 matching dictionary)
  1. activation: Father Jeromes DICTIONARY of Words/Phrases Used in the QUFD Website

Science (2 matching dictionaries)
  1. The Computational Beauty of Nature (No longer online)
  2. Activation: NRC Glossary of Nuclear Terms --

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms (No longer online)
  3. activation: Construction deterioration & building durability glossary

(Note: See activate as well.)

Definitions from Wiktionary (activation)

noun:  Making active and effective; bringing into a state of activity.
noun:  (physics) The process of making a radioisotope by bombarding a stable element with neutrons or protons.
noun:  (biochemistry) The process by which molecules are made able to react.
noun:  (marketing) The promotion of a brand through an event or campaign.

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