Z chart n (Statistics) statistics a chart often used in industry and constructed by plotting on it three series: monthly, weekly, or daily data, the moving annual total, and the cumulative total dating from the beginning of the current year Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014