Ordinations which were considered null and void and hence repeated, because they were administered by an heretical, a schismatical, or a deposed bishop, or even by a bishop in proper standing, if there was some defect in conferring orders. An ordination by an heretical or schismatic bishop is valid provided the essentials of the Sacrament of Orders are observed in regard to matter and form and requisite intention.

New Catholic Dictionary

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