noun. 
                    The art or practice of ascending in and of managing balloons.
                  
                
                  
                    noun. 
                    In political and stock-exchange slang, the operation of booming a candidate, or of inflating the money-market, by means of fictitious favorable reports.
                  
                
                  
                    noun. 
                    In a steam-boiler, the lifting of scum on the surface of the water by the liberation of steam from it.