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from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or being a telephone with which the user places calls by pressing pushbuttons that generate and transmit tones of differing pitch, these tones corresponding to the digits of the number being called.
  • n. A touch-tone telephone.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.


From the trade name Touch-Tone, 1960. (Wiktionary)



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