Mengelberg (?m????l?b???; Dutch ?m???lb?rx) n (Biography) (Josef) Willem (?w?l?m). 1871?1951, Dutch orchestral conductor, noted for his performances of the music of MahlerCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014