(US, telecommunications, informal, historical) Collectively, the family of companies associated with American Telephone & Telegraph, providing telephoneservice in the United States for many years through 1983.
ma bell - Computer Definition
The common nickname for the Bell Telephone Company when it was the monopoly communications provider in the U.S. See Bell System.
ma bell - Investment & Finance Definition
slang term referring to AT&T Corp., which provided the original telephone
service in the United States, and thus was considered the “mother” of the
telecom industry. It is no longer commonly used.