Dictionary.net

of or relating to Donatism

One of a body of African schismatics of the fourth century, so named from their founder Donatus, bishop of Casa Nigra in Numidia, who taught that though Christ was of the same substance with the Father yet that He was less than the Father, that the Catholic Church was not infallible, but had erred in his time and become practically extinct, and that he was to be the restorer of it. All joining the sect required to be rebaptized, baptism by the impure church being invalid.