The Greek dichostasia (G1370) means standing apart, division, or dissension — the splitting of a group into opposing factions. It is listed among the works of the flesh in Galatians 5 and among behaviors Paul warns the Romans to avoid.
Dichostasia is the opposite of the unity Christ prays for in John 17. Division in the church is not a minor organizational inconvenience — Paul lists it among the works of the flesh alongside idolatry (Galatians 5:20). The body of Christ is meant to display the unity that the Trinity possesses. When believers embrace dichostasia, they defame the gospel.