Lexical Definition

‎καθέδρα‎ kathédra (kath-ed'-rah) seat G:N-F
from ‎κατά‎ and the same as ‎ἑδραῖος‎

seat.

Usage: 3 forms in 18 verses
Form Translated As     In Verse(s)
καθέδρασ chair LXX.1Sam.20.25LXX.1Kgs.10.19LXX.2Kgs.16.18LXX.2Chr.9.18
of their of sitting down LXX.2Kgs.17.25
seat Matt.23.2
seats Matt.21.12Mark.11.15
καθέδραν form LXX.1Kgs.10.5LXX.2Chr.9.4
his chair LXX.1Sam.20.25
my sitting down LXX.Ps.139.2
of your sitting-down LXX.2Kgs.19.27
their sitting down LXX.Lam.3.63
καθέδρα a chair LXX.Ps.1.1
chair LXX.Ps.107.32
your chair LXX.1Sam.20.18LXX.1Kgs.8.13

Abbott-Smith

καθ-έδρα, -ας, ἡ (< κατά, + ἔδρα, a seat), [in LXX for מוֹשָׁב and cogn. forms;]
a chair, seat: Mt 21:12, Mk 11:15; of teachers, Mt 23:2.†

Abbott-Smith References

Book Refs
Matthew 21:12 · 23:2
Mark 11:15

Liddell-Scott-Jones

καθέδρα-α, ,

seat, κ. τοῦ λαγῶ a hare's seat or form, [Refs 5th c.BC+]; chair, [Refs 1st c.AD+]; opposed to κλίνη, [Refs 1st c.AD+]; of rowers' seats, [Refs 2nd c.BC+]; κ. λοιμῶν, πρεσβυτέρων, [LXX]

__2 sitting part, posteriors, [Refs 5th c.BC+]
__3 base of a column, [Refs 1st c.BC+]
__II sitting posture, [Refs 4th c.BC+]
__II.2 sitting idle, inaction, ἐν τῇ καθέδρα [Refs 5th c.BC+]
__II.3 session, [Refs 2nd c.AD+]
__III chair of a teacher, ἐπὶ τῆς Μωυσέως κ. ἐκάθισαν [NT]; professorial chair, ἐπὶ τῆς κ. σοφιστής [Refs 3rd c.AD+]
__IV imperial throne, τὸν ἐπὶ τῇ κ. τοῦ Αὐτοκράτορος, the Emperor's representative, [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.Ps.1.1Matt.23.2