|Easton's Bible Dictionary|
A separation, an alienation causing divisions among Christians, who ought to be united (1 Corinthians 12:25).
Noah Webster's Dictionary
(n.) Division or separation; specifically (Eccl.), permanent division or separation in the Christian church; breach of unity among people of the same religious faith; the offense of seeking to produce division in a church without justifiable cause.
Int. Standard Bible Encyclopedia
siz'-m (schisma): Only in 1 Corinthians 12:25. The same Greek word, literally, "a split," is translated "rent" in Matthew 9:16 Mark 2:21; and "division" in John 7:43; John 9:16; John 10:19. It designates "a separation," not from, but within, the church, interfering with the harmonious coordination and cooperation of the members described in the preceding verses (1 Corinthians 12:18). The ecclesiastical meaning is that of a break from a church organization, that may or may not be connected with a doctrinal dissent.
Schism (1 Occurrence)
1 Corinthians 12:25 That there should be no schism in the body; but that the members should have the same care one for another. (KJV ASV WBS)