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dial tone

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dial tone

–noun
(in a telephone) a tone that indicates the line is ready for dialing.

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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dial tone  
n.  A low, steady tone in a telephone receiver indicating that a number may be dialed.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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