: a private telephone switchboard

Word History


private branch exchange

First Known Use

1944, in the meaning defined above

Time Traveler
The first known use of PBX was in 1944

Dictionary Entries Near PBX

Cite this Entry

“PBX.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/PBX. Accessed 16 Apr. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!