conference call

a telephone call that interconnects three or more phones simultaneously.

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
conference call
a special telephone facility by which three or more people using conventional or cellular phones can be linked up to speak to one another

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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Example sentences
It was so difficult that, midway through, they opted to end the video chat and move to a conference call.
If you're planning a business trip, consider whether a video linkup or a conference call will suffice.
He'd usually do an hour or two of official business, operating a multimillion-dollar company by email and conference call.
There's a weekly conference call with all the country managers.
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