Chiefly Canadian. of or pertaining to a radio program that receives telephone calls from listeners on the air.

1950–55; hot + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hotline (ˈhɒtˌlaɪn)
1.  a direct telephone, teletype, or other communications link between heads of government, for emergency use
2.  any such direct line kept for urgent use

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

Hotline definition

1. Hotline Communications Ltd..
2. Hotline Connect.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Shortly thereafter, it established a public hotline to answer veterans'
  inquiries about the status of their personal information.
Soon they'll have a hotline to get kids to report on their parents if the house
  is too warm.
Instead of the movie a box pops up directing you to a service hotline that is
  obviously less than helpful.
But the two sides are now talking about setting up a military hotline.
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