Webster's English Dictionary

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emission

emis.sion \e--'mish-*n\ \-'mis-iv\ n 1a: an act or instance of emitting : 
   EMANATION  archaic  1b: PUBLICATION  1c: a putting into circulation  1d: a 
   flow of electrons from a surface  2a: something sent forth by emitting  2b: 
   EFFLUVIUM  - emis.sive aj