Lexical Definition

‎συγκάθημαι‎ synkáthēmai (soong-kath'-ay-mahee) to sit with G:V
from ‎σύν‎ and ‎κάθημαι‎

sit with.

Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
συγκαθήσθαι for them to sit together LXX.Ps.101.6
συγκαθήμενοσ sitting Mark.14.54
συγκαθήμενοι sitting with Acts.26.30

Abbott-Smith

συν-κάθημαι (Rec. συγκ-), [in LXX: Ps 100 (101):6* (ישׁב) * ;]
to sit together or with: c. dat., Ac 26:30; seq. μετά, c. gen., Mk 14:54.†

Abbott-Smith References

Book Refs
Psalms 101:6*
Mark 14:54
Acts 26:30

Liddell-Scott-Jones

συγκάθημαι-ημαι,

Ionic dialect συγ-κάτημαι, used as perfect of συγκαθέζομαι, sit as assessor with, [τῷ Καίσαρι] Wilcken [Refs 1st c.AD+]; live in the same quarters, [Refs 5th c.BC+]; of a number of persons, sit together, [Refs 5th c.BC+]; especially of persons sitting to deliberate, sit in conclave, meet in assembly, ἐν τῇ Πυκνὶ.. πρόβατα -ήμενα [Refs 5th c.BC+]

__II sink or subside together, settle down, [Refs 1st c.BC+]