plural impacts            
        
    1
                    
        a
    
          
                                          
              
          
                                                      : an impinging or striking especially of one body against another                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a forceful contact or onset                                      
                
                                
            also                
          
                                                      : the impetus communicated in or as if in such a contact                                      
            
            2
                    
                                          
              
          
                                                      : the force of impression of one thing on another : a significant or major effect                                      
              
                             
the impact of science on our society
                                       a study outlining the potential environmental impacts of the construction project
                         
                
                    
            
              impacted; impacting; impacts            
        
    1
                    
        a
    
          
                                          
              
          
                                                      : to have a direct effect or impact on : impinge on                                      
                
                    
        b
    
          
                                          
              
          
                                                      : to strike forcefully                                      
                
                                
            also                
          
                                                      : to cause to strike forcefully                                      
            
            2
                    
        a
    
          
                                          
              
          
                                                      : to fix firmly by or as if by packing or wedging                                      
                
                    
        b
    
          
                                          
              
          
                                                      : to press together                                      
                
                    
1
                    
                                          
              
          
                                                      : to have an impact                                      
                
                  —often used with on
    
                
                    
2
                    
                                          
              
          
                                                      : to impinge or make contact especially forcefully                                      
                
                    
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  Merriam-Webster unabridged




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