From the trade name Touch-Tone, 1960.
touch-tone (not comparable)
- Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.
touch-tone (plural touch-tones)
- A telephone with buttons that produce tones, one for each digit.
- a teleconference service for touch-tones only
- A tone produced by such a telephone.
- software to decode touch-tones