[sigzero]

Correct!

The word cathedral comes from a Latin word meaning “seat.” The seat referred to is the seat of the bishop, who is the leader of a group of churches related to the cathedral. The bishop's seat is both a metaphor for the cathedral as the bishop's “seat of power” and his actual chair, the "cathedra," inside the cathedral.

[schoen]

Strictly, it's a Greek word meaning "seat" (καθέδρα), although it was borrowed into Latin with what I believe is a more restricted meaning. There is also a Latin word meaning "seat" (sedes) which is also used to refer to the seat of a bishop (an episcopal see)!

[thaumasiotes]

> The word cathedral comes from a Latin word meaning “seat.”

It's not a possible word in Latin; it would have to be a loan from Greek.