1. 
   Photocatalysis
   In chemistry, photocatalysis is the acceleration of a photoreaction in the presence of a catalyst. In catalysed photolysis, light is absorbed by an adsorbed substrate. In photogenerated catalysis, the photocatalytic activity (PCA) depends on the ability of the catalyst to create electron–hole pai...
   Found op http://en.wikipedia.org/wiki/Photocatalysis
   
   
2. 
   photocatalysis
   (fo″to-kә-tal´ĭ-sis) promotion or stimulation of a chemical reaction by light. adj., photocatalyt´ic., adj.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   photocatalysis
   photocatalysis 1. The promotion or stimulation of a reaction by light. 2. A change in the rate of a chemical reaction due to the action of light. 3. The acceleration or deceleration of the speed at which a chemical reaction occurs, caused by electromagnetic radiation and especially visible light.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2803/5
   
   

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