Centrexn.
/ˈsɛntrɛks/, U.S. /ˈsɛntrɛks/ Telecommunications.
A service offered by a telecommunications company in which the switching of phone lines is performed at their central exchange, rather than at a private branch exchange operated by the client organization. Frequently attributive.
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1960 Telephone Engineer & Managem. 1 Dec. 16/2 Illinois Bell has adopted ‘Centrex Service’ as the name for the communications package designed to provide service from No. 5 crossbar central offices for telephones of large business customers.
1967 Bull. Rocky Mountain Mod. Lang. Assoc. 21 33/1 A new foreign language laboratory..will be used for..transmission over the Centrex telephone system on the campus.
1986 Financial Times 31 July 7/2 Types of service available on Centrex include direct dialling to individual extensions, call forwarding, conference calls, abbreviated dialling and automatic call-back to busy extensions.
2001 Wall St. Jrnl. 15 Oct. r18/5 Sylantro had assumed its best potential customers would be users of Centrex services.
This is a new entry (OED Third Edition, September 2016; most recently modified version published online December 2021).
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n.1960