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tie line

The definition of a tie line is a direct connection between two telephone lines in a private network, typically of the same business.

(noun)

An example of a tie line is a three-digit extension used by employees to call their Human Resources department.

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See tie line in Webster's New World College Dictionary

☆ a direct telephone line between extensions in two or more PBX systems
☆ a line used to connect one electric power or transportation system with another

See tie line in American Heritage Dictionary 4

noun

A communications link between extensions of a private telephone system.
A connection between systems, such as electrical power or communications systems.

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