from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A Christian heresy of the second and third centuries A.D. that rejected the Old Testament and denied the incarnation of God in Jesus as a human.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An early Christian following akin to but distinct from gnosticism which rejected the validity of the Old Testament and essentially denied the Trinity, regarding God the Father as an inferior demiurge, and that Jesus had nothing to do with the First Person of the Trinity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the Christian heresy of the 2nd and 3rd centuries that rejected the Old Testament and denied the incarnation of God in Jesus as a human
After Marcion (died c. A.D. 160), Pontic merchant and heretic in Rome.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Marcion + -ism. (Wiktionary)