[kuh-thee-druh, kath-i-]
noun, plural cathedrae [kuh-thee-dree, kath-i-dree] .
the seat or throne of a bishop in the principal church of a diocese.
an official chair, as of a professor in a university.
an ancient Roman chair used by women, having an inclined, curved back and curved legs flaring outward: the Roman copy of the Greek klismos.

1625–35; < Latin < Greek kathédra, derivative of kathézomai to sit down; see cata-, sit; cf. chair Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cathedra (kəˈθiːdrə)
1.  a bishop's throne
2.  the office or rank of a bishop
3.  See ex cathedra
[from Latin: chair]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"seat of a bishop in his church," 1829, from L. cathedra (see cathedral).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


(Latin: "chair," or "seat"), Roman chair of heavy structure derived from the klismos-a lighter, more delicate chair developed by the ancient Greeks

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
My own complaint is that arguments are presented ex cathedra without adequate peer review or bibliography.
But it expects to pronounce ex cathedra only in real statistical emergencies.
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