Definition of Quartodeciman in English:

Quartodeciman

Pronunciation /ˌkwɔːtə(ʊ)ˈdɛsɪmən/

noun

Christian Church
  • Any of a group of early Christians who celebrated Easter on the day of the Jewish Passover (the 14th of Nisan), whether this was a Sunday or not.

    The practice (chiefly observed in Proconsular Asia) was condemned by the Council of Nicaea, a.d. 325.

adjective

Christian Church
  • Of or relating to the Quartodecimans, or their method of observing Easter.

Origin

Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From post-classical Latin quartadecimanus, quartodecimanus member of a group of early Christians who celebrated Easter on the 14th day from classical Latin quartus decimus fourteenth (from quartus fourth + decimus tenth) + -ānus.