im·per·a·tive
                    
                                                                                                              
                                                                                                                                  im-ˈper-ə-tiv  
                                                                                                                              
            -ˈpe-rə-
                                                      
                                                          1
                    
                                          
              
          
                                                      : not to be avoided or evaded : necessary                                      
              
                             
an imperative duty
                         
                
                    2
                    
        a
    
          
                                          
              
          
                                                      : of, relating to, or constituting the grammatical mood that expresses the will to influence the behavior of another                                      
                
                    
        b
    
          
                                          
              
          
                                                      : expressive of a command, entreaty, or exhortation                                      
                
                    
        c
    
          
                                          
              
          
                                                      : having power to restrain, control, and direct                                      
                
                    
                                                      imperatively
                                      adverb
                                                                            
    
                                                      imperativeness
                                      noun
                                                                            
    1
                    
                                          
              
          
                                                      : something that is imperative (see imperative entry 1): such as                                      
                
                    
        c
    
          
                                          
              
          
                                                      : an obligatory act or duty                                      
                
                    
        d
    
          
                                          
              
          
                                                      : an obligatory judgment or proposition                                      
                
                    
2
                    
                                          
              
          
                                                      : the grammatical mood that expresses the will to influence the behavior of another or a verb form or verbal phrase expressing it                                      
                
                    
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  Merriam-Webster unabridged




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