Extended Strong's Greek Lexicon (Abbott-Smith based)
to assemble
Usage: 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)