("14-ism"). The early Christian custom, especially common in Asia Minor, of observing Easter on the 14th of the Jewish month of Nisan, whether or not it fell on a Sunday. Towards the end of the second century, Pope Victor suppressed Quartodecimanism and excommunicated the Bishop of Ephesus, who refused to comply. This action was rebuked by St. Irenaeus and most churches in Asia Minor retained the practice. It died out by the fifth century. See Easter.