GNU Collaborative International Dictionary of English

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1.       
   Phosphorescence (?), n. [Cf. F. phosphorescence.]
   1. The quality or state of being phosphorescent.
   
   [1913 Webster]
   
   
   2. The process of phosphorescing, especially that of emitting light after a source of excitation has been removed.  This contrasts with the process of fluorescence, in which a substance emits light of a lower wavelength than the illuminating light, only while the illumination continues.
   
   [PJC]
   
   
   3. Light emitted by the process of phosphorescence.
   
   [1913 Webster]