A rent or fissure; generally used in the New Testament to denote a division within the Christian church, by contentions and alienated affections, without an outward separation into distinct bodies, 1 Corinthians 1:10-12 12:25,26. The sin may lie on the side of the majority, or of the minority, or both. It is a sin against Christian love, and strikes at the heart of Christianity, John 17:21 Romans 12:4-21.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'SCHISM'". "American Tract Society Bible Dictionary".