| n. pl.   ca·the·drae (-drē)  1.  A bishop's official chair or throne. 2.  The office or see of a bishop. 3.  The official chair of an office or a position, as of a professor. [Middle English, from Latin, chair, from Greek kathedrā : kat-, kata-, cata- + hedrā, seat; see  sed- in the Appendix of Indo-European roots.] | 
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