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English definition of “tone”

tone

noun [S]
 
 
/təʊn/ COMMUNICATIONS
an electronic sound that you hear on a phone line: Please leave your message after the tone.
a busy tone ( US also the busy tone, UK also an engaged tone) an electronic sound when you call a phone number that tells you the person you are calling is already using the phone for another call: I've tried calling her several times but I keep on getting a busy tone.
→ See also dial tone, dialling tone
(Definition of tone from the Cambridge Business English Dictionary © Cambridge University Press)
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