Usually means: Activation of molecules using light.
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We found 5 dictionaries that define the word photoactivation:

General (4 matching dictionaries)
  1. photoactivation: Wiktionary
  2. photoactivation: Infoplease Dictionary
  3. photoactivation: Dictionary.com
  4. Photoactivation: Wikipedia, the Free Encyclopedia

Medicine (1 matching dictionary)
  1. photoactivation: Merriam-Webster Medical Dictionary

Definitions from Wiktionary (photoactivation)

noun:  (physics, chemistry) The absorption of energy from a photon in raising a molecule (or chromophore) from the ground state; especially the first stage of photosynthesis in which energy is absorbed by chlorophyll

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