first floor
noun
            
               plural first floors            
        
    1
                    
                                          
              
          
                                                      : the floor of a building most nearly on a level with the ground : ground floor sense 1                                      
                
                    
2
                    
                                chiefly British 
                                  
              
          
                                                      : the floor next above the ground floor                                      
                
                    
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  Merriam-Webster unabridged




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