meliorism
noun
                                                                                                                            
                                                            me·lio·rism
                    
                                                                                                              
                                                                                                                                  ˈmēl-yə-ˌri-zəm  
                                                                                                                              
            ˈmē-lē-ə-
                                                      
                                                          
                                
              
          
                                                      : the belief that the world tends to improve and that humans can aid its betterment                                      
                
                    
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  Merriam-Webster unabridged




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