- noun a method of dialling in a telephone system in which each number on the telephone handset generates two tones. Each row and column of the telephone number grid generates a different tone, so each number will send one tone for the corresponding column and another for the row.
- acronym forpulse-dialling
- noun telephone dialling that dials a telephone number by sending a series of pulses along the line
- acronym fordual-tone multifrequency