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tone dialing

a system of calling telephone numbers wherein tones of differing pitch corresponding to the digits in the number called are electronically generated by manipulating pushbuttons (contrasted with pulse dialing).
Related forms
tone-dialing, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for tone dialing

a mode of telephone dialing in which each digit has a different sound; also called touch-tone dialing's 21st Century Lexicon
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