Abbott-Smith Manual Greek Lexicon
ἐπι-συν-αγωγή (G1997)
2 **† ἐπι-συν-αγωγή , -ῆς, ἡ ( ἐπισυνάγω ), [in LXX: II Mac 2:7 * ;] a gathering together, assembly : He 10:25 ; seq. ἐπί , II Th 2:1 (cf. II Mac, l.c. ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain