1
                    
                                          
              
            
                  —used as a function word to make negative a group of words or a word
    
                
                    
2
                    
                                          
              
            
                  —used as a function word to stand for the negative of a preceding group of words
is sometimes hard to see and sometimes not
    
                
                    
                                
              
          
                                                      : a logical operator (see operator sense 3a) that produces a statement that is the inverse (see inverse entry 2 sense 3a) of an input statement                                      
                
                    
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  Merriam-Webster unabridged




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