Dictionary of Biblical Words:
Used over 200 times as a common title amongst the children of God, and given by Christ in Matt. 23:8. “One is your master, even Christ, and all ye are brethren.” It is a title that is the birthright of every member of God’s family. The “many sons” whom He brings to glory, and whom the Lord is not ashamed to call His “brethren.” To apply the name in any narrower sense is contrary to the teaching of Scripture.
Strong’s Dictionary of Greek Words:
Transliteration:
philadelphos
Meaning:
from 5384 and 80; fond of brethren, i.e. fraternal
KJV Usage:
love as brethren