reduplication
noun
                                                                                                                            
                                                            re·du·pli·ca·tion
                    
                                                                                                              
                                                                                                                                  ri-ˌdü-pli-ˈkā-shən 
                                                                                                                              
            ˌrē-,
                                                                                                                              -ˈdyü-
                                                      
                                                          1
                    
                                          
              
          
                                                      : an act or instance of doubling or reiterating                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : an often grammatically functional repetition of a radical element or a part of it occurring usually at the beginning of a word and often accompanied by change of the radical vowel                                      
                
                    
        b(1)
    
                
                                          
              
          
                                                      : a word or form produced by reduplication                                      
                
                    
        (2)
    
          
                                          
              
          
                                                      : the repeated element in such a word or form                                      
                
                    
3
                    
                  
                                                      reduplicatively
                                      adverb
                                                                            
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  Merriam-Webster unabridged




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