Usage: 5 forms in 16 verses
Form Translated As     In Verse(s)
εξεκκλησιάσθησαν they were assembled LXX.2Sam.20.14
εξεκκλησιάσθη an assembly was held LXX.Josh.18.1
held an assembly LXX.Judg.20.1LXX.Jer.26.9
was assembled LXX.2Chr.5.3
εξεκκλησίασεν held an assembly LXX.1Kgs.8.1
εξεκκλησίασε David assembled LXX.1Chr.13.5
David held an assembly LXX.1Chr.28.1
Solomon held an assembly LXX.2Chr.5.2
assembly LXX.2Chr.24.6
he assembled LXX.2Chr.15.9
he held an assembly LXX.Lev.8.4LXX.1Kgs.12.21LXX.2Chr.11.1
held an assembly LXX.Num.20.10
εξεκκλησίασαν they held an assembly LXX.Jer.36.9

Liddell-Scott-Jones

ἐξεκκλησιάζω (exekklēsiazō) to assemble G:V

ἐξεκκλησιάζω,

={ἐκκλησιάζω}, [Refs 4th c.BC+]