the.com/cathedra

The chair that turned sitting down into the most authoritative act in Christendom.

means A cathedra is the official chair or throne of a bishop, the seat that symbolizes his teaching authority and that gives a cathedral its name as the church where that chair resides.

from Straight from the Greek 'kathedra,' meaning simply 'a seat' — built from 'kata' (down) and 'hedra' (seat or sitting). The Greeks used it for any chair, but also for the seat of a teacher, which is why a professor's 'chair' and the word 'chair' itself (via the same root, through Latin 'cathedra' and Old French 'chaiere') all trace back here. Latin borrowed it wholesale, and the Church gave it gravity: the bishop's seat became the seat of doctrine. It's the same root that lives on in 'ex cathedra' — literally 'from the chair' — the phrase for pronouncements made with full official authority.

root word
Greek kathedra simply means seat or bench
ex cathedra
Pope speaking from the chair is officially infallible
cathedral named after it
A church is a cathedral only by housing one
professor's chair
Academic chairs and tenure descend from the same word
for instance

chair of saint peter — the papal throne in st. peter's basilica, vatican city, symbolizing papal authority since the 4th century

cathedra of monteregale — medieval throne-like episcopal chair at mondovì cathedral in piedmont, italy, carved from stone around 1500s

archbishop's cathedra cologne — the ceremonial throne of the archbishop of cologne at cologne cathedral, germany, a unesco world heritage site

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