quartile
noun
                                                                                                                            
                                                            quar·tile
                    
                                                                                                              
                                                                                                                                  ˈkwȯr-ˌtī(-ə)l  
                                                                                                                              
            -tᵊl
                                                      
                                                          
                                
              
          
                                                      : any of the three values that divide the items of a frequency distribution into four classes with each containing one fourth of the total population                                      
                
                                
            also                
          
                                                      : any one of the four classes                                      
            
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  Merriam-Webster unabridged




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