1
                    
        a
    
          
                                          
              
          
                                                      : something that forms or serves as a head                                      
                
                                
            especially                
          
                                                      : an inscription, headline, or title standing at the top or beginning (as of a letter or chapter)                                      
            
            
        b
    
          
                                          
              
          
                                                      : the address and date at the beginning of a letter showing its place and time of origin                                      
                
                    
2
                    
                                          
              
          
                                                      : the compass direction in which the longitudinal axis of a ship or aircraft points                                      
                
                                
            broadly                
          
                                                      : direction                                      
            
            3
                    
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  Merriam-Webster unabridged




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