tonepad (?t??n?pæd) n (Communications & Information) a keypad used to transmit information by generating tones that can be recognized by a central system as corresponding to particular digitsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014