+ accompany, assemble (selves, together), bestow, come together, gather (selves together, up, together), lead into, resort, take in

“Gathering, A” From Dictionary of Biblical Words:

may mean any concourse of people, but is generally used for Christians assembled in the name of Christ, as in Matt. 18:20, and 1 Cor. 5:4.

“Midst, Jesus in the” From Dictionary of Biblical Words:

An expression probably gathered from Matt. 18:20, and meaning that wherever even two or three were gathered together in His name (see carefully ch. 16:16), there Jesus would be in their midst.

Strong’s Dictionary of Greek Words:

Greek:
συνάγω
Transliteration:
sunago
Phonic:
soon-ag’-o
Meaning:
from 4862 and 71; to lead together, i.e. collect or convene; specially, to entertain (hospitably)
KJV Usage:
+ accompany, assemble (selves, together), bestow, come together, gather (selves together, up, together), lead into, resort, take in