monotheistic
adjective
                                                                                                                            
                                                            mono·the·is·tic
                    
                                                                                                              
                                                                                                                                  ˌmä-nə-thē-ˈi-stik  
                                                      
                                                          
            
            variants  
 or less commonly monotheistical    
        
    
                                
              
          
                                                      : of, relating to, or characterized by the doctrine or belief that there is only one God                                      
              
                             
a monotheistic religion
                                       The implication was one that is familiar to many Sikhs, who are part of a separate, monotheistic faith that is neither Hinduism nor Islam, but who are often mistaken for being something that they are not.— Sharon Otterman
Sharon Otterman
                         
                
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  Merriam-Webster unabridged




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