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Meaning of photoactivation

pho•to•ac•ti•va•tion

Pronunciation: (fō"tō-ak"tu-vā'shun), [key]
— n. Chem.
  1. the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.