courteous
adjective
                                                                                                                            
                                                            cour·te·ous
                    
                                                                                                              
                                                                                                                                  ˈkər-tē-əs 
                                                                                                                              
             British also  ˈkȯ-
                                                      
                                                          1
                    
                                          
              
          
                                                      : marked by polished manners, gallantry, or ceremonial usage of a court                                      
                
                    
2
                    
                                          
              
          
                                                      : marked by respect for and consideration of others                                      
                
                    
                                                      courteously
                                      adverb
                                                                            
    
                                                      courteousness
                                      noun
                                                                            
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  Merriam-Webster unabridged




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