1
                    
                                          
              
          
                                                      : of or relating to painting in outdoor daylight                                      
                
                    
2
                    
                                          
              
          
                                                      : of or relating to a branch of impressionism that attempts to represent outdoor light and air                                      
                
                    
plein air
2 of 2French adjective
                                
              
          
                                                      : open-air : outdoor                                      
                
                    
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  Merriam-Webster unabridged




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