• Webster's Revised Unabridged Dictionary
    • n Marcionite mär"shŭn*īt (Eccl. Hist) A follower of Marcion, a Gnostic of the second century, who adopted the Oriental notion of the two conflicting principles, and imagined that between them there existed a third power, neither wholly good nor evil, the Creator of the world and of man, and the God of the Jewish dispensation.
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Century Dictionary and Cyclopedia
    • n marcionite A follower of Marcion of Sinope, a Gnostic religious teacher of the second century, and the founder at Rome of the Marcionite sect, which lasted until the seventh century or later. Marcion taught that there were three primal forces: the good God, first revealed by Jesus Christ; the evil matter, ruled by the devil; and the Demiurge, the finite and imperfect God of the Jews. He rejected the Old Testament, denied the incarnation and resurrection, and admitted only a gospel akin to or altered from that of St. Luke and ten of St. Paul's epistles as inspired and authoritative; he repeated baptism thrice, excluded wine from the encharist, inculcated an extreme asceticism, and allowed women to minister. See Cerdonian.
    • marcionite Pertaining to or characterized by the principles of Marcion: as, the Marcionite Church.
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Chambers's Twentieth Century Dictionary
    • n., adj Marcionite mar′shun-īt a follower of Marcion of Sinope (died 165 A.D.), who, partly under Gnostic influences, constructed an ethico-dualistic philosophy of religion, with rigorously ascetic practices. He claimed alone to have understood Paul aright, and accepted as authoritative his own version of Luke and ten of Paul's epistles
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In literature:

The Marcionites published a Gospel under the name of St. Matthias, in order to confirm their doctrine.
"Superstition In All Ages (1732)" by Jean Meslier
The Gnostic Schools and the Marcionite Church are to some extent the answer.
"History of Dogma, Volume 1 (of 7)" by Adolph Harnack
Neither Marcionites, Severians, nor the later Manicheans recognised the Acts of the Apostles.
"History of Dogma, Volume 2 (of 7)" by Adolph Harnack
Rome and Italy were the seat of the Marcionites.
"An Essay on the Development of Christian Doctrine" by John Henry Cardinal Newman
One, who followed the Marcionites and Arians, that razed out such places of Holy Writ, as were against him.
"Two Addresses" by Nicholas Rigby
Marcionites and Montanists had also worked in the field.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5" by Various
Of these sects it is sufficient to name the Marcionites 110 A.D.
"The Transformation of Early Christianity from an Eschatological to a Socialized Movement" by Lyford Paterson Edwards