ex-cathedra

ex cathedra

[eks kuh-thee-druh, kath-i-druh]
noun
from the seat of authority; with authority: used especially of those pronouncements of the pope that are considered infallible.

Origin:
1810–20; < Latin ex cathedrā literally, from the chair

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World English Dictionary
ex cathedra (ɛks kəˈθiːdrə)
 
adj, —adv
1.  with authority
2.  RC Church (of doctrines of faith or morals) defined by the pope as infallibly true, to be accepted by all Catholics
 
[Latin, literally: from the chair]

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Etymonline
Word Origin & History

ex cathedra
1635, L., lit. "from the (teacher's) chair."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
ex cathedra [(eks kuh-thee-druh)]

Descriptive term for an official pronouncement from the pope. Ex cathedra is Latin for “from the chair.” Roman Catholics believe that the pope speaks infallibly when speaking ex cathedra on questions of faith or morals, such as when Pope Pius XII declared in 1950 that Mary, the mother of Jesus, was physically taken up to heaven after her death.

Note: Figuratively, any authoritative pronouncement may be called “ex cathedra.”
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