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conference call

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noun
  1. a telephone call that interconnects three or more phones simultaneously.
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Origin of conference call

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for conference call

conference call

noun
  1. a special telephone facility by which three or more people using conventional or cellular phones can be linked up to speak to one another
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012