What is the meaning of Cathedral?

Relating to the throne or the see of a bishop.

The principal church of an archbishop's/bishop's archdiocese/diocese which contains an episcopal throne.

A large or important church building.

A large, impressive, lofty, and/or important building or place of some other kind.

A large buttressed structure built by certain termites.

A mainstream system or establishment in society, held to be liberal or leftist and to be working against the interests of the people or nation.

cathedral (relating to the see of a bishop)

Source: wiktionary.org