"Schism (from the Greek schisma, rent, division) is, in the language of theology and canon law, the rupture of ecclesiastical union and unity, i.e. either the act by which one of the faithful severs as far as in him lies the ties which bind him to the social organization of the Church and make him a member of the mystical body of Christ, or the state of dissociation or separation which is the result of that act. In this etymological and full meaning the term occurs in the books of the New Testament. By this name St. Paul characterizes and condemns the parties formed in the community of Corinth (1 Corinthians 1:12): "I beseech you, brethren", he writes, ". . . that there be no schisms among you; but that you be perfect in the same mind, and in the same judgment" (ibid., i, 10). The union of the faithful, he says elsewhere, should manifest itself in mutual understanding and convergent action similar to the harmonious co-operation of our members which God hath tempered "that there might be no schism in the body" (1 Corinthians 12:25). Thus understood, schism is a genus which embraces two distinct species: heretical or mixed schism and schism pure and simple. The first has its source in heresy or joined with it, the second, which most theologians designate absolutely as schism, is the rupture of the bond of subordination without an accompanying persistent error, directly opposed to a definite dogma. This distinction was drawn by St. Jerome and St. Augustine. "Between heresy and schism", explains St. Jerome, "there is this difference, that heresy perverts dogma, while schism, by rebellion against the bishop, separates from the Church. Nevertheless there is no schism which does not trump up a heresy to justify its departure from the Church (In Ep. ad Tit., iii, 10). And St. Augustine: "By false doctrines concerning God heretics wound faith, by iniquitous dissensions schismatics deviate from fraternal charity, although they believe what we believe" (On Faith and the Creed 9)... "
https://www.newadvent.org/cathen/13529a.htm