Source : Webster's Revised Unabridged Dictionary (1913)

Antinomian \An`ti*no"mi*an\, a. [See {Antimony}.]
   Of or pertaining to the Antinomians; opposed to the doctrine
   that the moral law is obligatory.

Antinomian \An`ti*no"mi*an\, n. (Eccl. Hist.)
   One who maintains that, under the gospel dispensation, the
   moral law is of no use or obligation, but that faith alone is
   necessary to salvation. The sect of Antinomians originated
   with John Agricola, in Germany, about the year 1535.
   --Mosheim.

Source : WordNet®

antinomian
     n : a follower of the doctrine of antinomianism

antinomian
     adj : relating to or influenced by antinomianism