extension
/ɪkˈsten·ʃən/ n [C] (abbreviation ext.) (PHONE)Definition
› any of two or more telephones in the same house that share the same number: We have an extension in our bedroom. › An extension is also any of the telephones connected to a central system, esp. in a business.
(Definition of extension n (PHONE) from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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