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.
Compare PABX

Origin of PBX

P(rivate) B(ranch) Ex(change)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for pbx

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