definable
adjective
                                                                                                                            
                                                            de·fin·able
                    
                                                                                                              
                                                                                                                                  di-ˈfī-nə-bəl  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : able to be defined                                      
                
                    
2
                    
                                          
              
          
                                                      : able to be specified to have a particular function or operation                                      
              
                             
definable keys
                         
                
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  Merriam-Webster unabridged




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