Dial Tone Definition

noun
A buzzing or humming sound indicating to the user of a telephone that the line is open and a number may be dialed.
Webster's New World

A telephony signal, usually in the form of a sound, used to indicate that the telephone exchange is working, has recognized an off-hook, and is ready to accept a call.

Wiktionary

Other Word Forms of Dial Tone

Noun

Singular:
dial tone
Plural:
dial-tones

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dial tone