Agreement; union; peace; harmony. Concord is, "Agreement between persons; union in opinions, sentiments, views or interests..."
(Noah Webster's 1828 American Dictionary of the English Language)

And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.
2 Corinthians 6:15-16