a manually or automatically operated telephone facility that handles communications within an office, office building, or organization and that is connected to the public telephone network.
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Origin of PBX
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for PBX
It is a PBX machine and is in the nature of a board up on the wall and it has several sections.Warren Commission (10 of 26): Hearings Vol. X (of 15)|The President's Commission on the Assassination of President Kennedy
British Dictionary definitions for PBX
abbreviation for (in Britain)
private branch exchange; a telephone system that handles the internal and external calls of a building, firm, etc
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