: the continuous operation of a device (such as a computer) as a test for defects or failure prior to putting it to use                                      
                
                    
            
              burned in or burnt in; burning in; burns in            
        
    
                                
              
          
                                                      : to increase the density of (portions of a photographic print) during enlarging by giving extra exposure                                      
                
                    
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  Merriam-Webster unabridged




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