Quick Definition
I gather together, assemble
Strong's Definition
to convene
Derivation: from G4862 (σύν) and (to hoard);
KJV Usage: call (gather) together
Thayer's Greek Lexicon
συναθροίζω: 1 aorist participle συναθροίσας; perfect passive participle συνηθροισμενος; from (Euripides, Aristophanes, others), Isocrates down; the Sept. chiefly for χΘαΗυ and χΔαΕΜυ; to gather together with others; to assemble: τινας, Act_19:25; passive, to be gathered together i. e. come together, Luk_24:33 R G; Act_12:12.
Mounce Concise Greek Dictionary
συναθροίζω synathroizō 2x
to gather; to bring together, Act_19:25 ;
pass. to come together, convene, Act_12:12
Abbott-Smith Greek Lexicon
συν -αθροίζω ,
[in LXX chiefly for H6908 ;]
to gather together, assemble: c . acc pers ., Act_19:25 ; pass ., Act_12:12 .†
ἀθροίζω
( <ἀθρόος , assembled in crowds, MM , VGT , s.v. ; <θρόος , a noise, tumult ),
[in LXX chiefly for H6908 ;]
to Gather, assemble: Luk_24:33 .†
Moulton & Milligan — Vocabulary of the Greek NT
συναθροίζω [page 601]
gather together, assemble. This verb, which is confined to Act_12:12 ; Act_19:25 , in the NT, occurs in a military report P Oxy X. 1253 .5 (iv/A.D.) συνηθρυκέναι τούς τε τὰ κοινὰ διοικοῦν [τας ] πρώτους [μ ]ετὰ σὲ τιμήν , have assembled the public magistrates next to yourself in rank (Edd.).
Liddell-Scott — Intermediate Greek Lexicon
συναθροίζω fut. σω "to gather together, assemble", of soldiers, Xen. , Plat. , etc. of things, in Pass., τὸ κεφάλαιον τούτων ξυνηθροισμένων the sum of these "collected amounts", Plat. of a single person, οὐ ξυνήθροισται στρατῷ "has not joined" the main army, Eur.
STEPBible — Tyndale Abridged Greek Lexicon
συν-αθροίζω
[in LXX chiefly for קָבַץ ;]
to gather together, assemble: with accusative of person(s), Act.19:25; pass., Act.12:12.†
ἀθροίζω
(ἀθρόος, assembled in crowds, MM, VGT, see word; θρόος, a noise, tumult), [in LXX chiefly for קָבַץ ;]
to Gather, assemble: Luk.24:33.†
(AS)