1
                    
                                          
              
          
                                                      : something that flows in: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : a tributary stream                                      
                
                    
        b
    
          
                                          
              
          
                                                      : fluid input into a reservoir or process                                      
                
                    
2
                    
                                          
              
          
                                                      : a factor modifying the balance and stability of an ecological community                                      
                
                    
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  Merriam-Webster unabridged




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