emission
noun
                                                                                                                            
                                                            emis·sion
                    
                                                                                                              
                                                                                                                                  ē-ˈmi-shən  
                                                      
                                                          
            1
                    
        a
    
          
                                          
              
          
                                                      : an act or instance of emitting : emanation                                      
                
                    
        b
    
          
                                archaic 
                                  
              
          
                                                      : publication                                      
                
                    
        c
    
          
                                          
              
          
                                                      : a putting into circulation                                      
                
                    
2
                    
        a
    
                      
                                          
              
          
                                                      : something sent forth by emitting: such as                                      
                
                    
        (1)
    
                
                                          
              
          
                                                      : electromagnetic radiation from an antenna or a celestial body                                      
                
                    
        (2)
    
          
                                 usually emissions                                  
              
          
                                                      : substances discharged into the air (as by a smokestack or an automobile engine)                                      
                
                    
        b
    
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  Merriam-Webster unabridged




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