of or relating to a tone-dialing system or a push-button phone operating on tone dialing.
(sometimes initial capital letter) a tone-dialing system.
a telephone utilizing this system.
Origin of touch-tone
An Americanism dating back to 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
of or relating to a telephone dialling system in which each of the buttons pressed generates a tone of a different pitch, which is transmitted to the exchange
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012