A — 1: καθέδρα
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(Strong's #2515 — Noun Feminine — kathedra — kath-ed'-rah )

from kata, "down," and hedra, "a seat," denotes "a seat" (Eng., "cathedral"), "a chair," Matthew 21:12; Mark 11:15; of teachers, Matthew 23:2 .

A — 2: πρωτοκαθεδρία
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(Strong's #4410 — Noun Feminine — protokathedria — pro-tok-ath-ed-ree'-ah )

"the first seat," Matthew 23:6; Mark 12:39; Luke 11:43; 20:46; see CHIEF , No. 6. Cp. ROOM.

THRONE.
B — 1: κάθημαι
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(Strong's #2521 — Verb — kathemai — kath'-ay-mahee )

"to sit, be seated," is translated "shall ... be seated" in Luke 22:69 , RV; "is seated," Colossians 3:1 , RV (AV, "shall ... sit" and "sitteth"). See SIT.