Lexical Definition

‎συναθροίζω‎ synathroízō (soon-ath-royd'-zo) to assemble G:V
from ‎σύν‎ and (to hoard)

call (gather) together.

Usage: 18 forms in 29 verses
Form Translated As     In Verse(s)
υνήθροισεν he gathered LXX.1Sam.14.52
συνηθροισμένοι gathered together Acts.12.12
συνηθροισμένη gathering together LXX.Num.16.11
συνηθροίσθησαν gathered together LXX.Josh.22.12LXX.1Chr.11.1
were gathered together LXX.1Sam.7.7LXX.1Kgs.11.24
συναθροισθήσονται shall be gathered together LXX.Amos.4.8
συναθροισθήναι to gather together LXX.Ezra.10.7
συναθροισθέντεσ gathering together LXX.Deut.1.41
συναθροιζομένων gathering together LXX.Jer.20.10
συναθροίσω gather together LXX.2Sam.3.21
συναθροίσασ having brought together Acts.19.25
συναθροίζουσιν gathered LXX.1Sam.29.1
συναθροίζονται gather together LXX.1Sam.28.4
gathered together LXX.1Sam.4.1LXX.1Sam.8.4LXX.2Sam.2.25
were gathered together LXX.1Sam.28.1
συναθροίζεται gathered together LXX.1Sam.25.1
συναθροίζεσθε Gather together LXX.Joel.3.11
συναθροίζει Saul gathers together LXX.1Sam.28.4
συνήθροισεν Jehu gathered together LXX.2Kgs.10.18
Jephthah gathered together LXX.Judg.12.4
gathered together LXX.1Kgs.20.1LXX.1Kgs.22.6
συνήθροισε Moses gathered together LXX.Exod.35.1
he gathered together LXX.2Sam.2.30
συνάθροισον gather together LXX.1Kgs.18.19

Abbott-Smith

συν-αθροίζω [in LXX chiefly for קבץ ;]
to gather together, assemble: c. acc. pers., Ac 19:25; pass., Ac 12:12.†

Abbott-Smith References

Book Refs
Acts 12:12 · 19:25

Liddell-Scott-Jones

συναθροίζω-οίζω,

perfect -ήθροικα (-υκα Papyrus) [Refs 4th c.AD+]:— gather together, assemble, especially of soldiers, [Refs 5th c.BC+]:—passive, [NT+5th c.BC+]

__2 of things, gather into one mass, τὸ κάταγμα εἰς ἕν [Refs 5th c.BC+]; τὸ σῶμα σ. bring the body together, [Refs 5th c.BC+]:—passive, ἐὰν εἰς μίαν.. πόλιν.. συναθροίζωοισθῇ τὰ.. Χρήματα [Refs]; τούτων συνηθροισμένων to sum up, therefore,[Refs 4th c.BC+]
__3 of a single person, οὐ συνήθροισται στρατῷ has not joined the main army, [Refs 5th c.BC+]

LSJ Scripture Refs: Acts.12.12