The Collaborative International Dictionary of English v.0.48:

Methodist \Meth"o*dist\, n. [Cf. F. m['e]thodiste. See
   Method.]
   1. One who observes method. [Obs.]
      [1913 Webster]

   2. One of an ancient school of physicians who rejected
      observation and founded their practice on reasoning and
      theory. --Sir W. Hamilton.
      [1913 Webster]

   3. (Theol.) One of a sect of Christians, the outgrowth of a
      small association called the "Holy Club," formed at Oxford
      University, a. d. 1729, of which the most conspicuous
      members were John Wesley and his brother Charles Wesley;
      -- originally so called from the methodical strictness of
      members of the club in all religious duties.
      [1913 Webster]

   4. A person of strict piety; one who lives in the exact
      observance of religious duties; -- sometimes so called in
      contempt or ridicule.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Methodist \Meth"o*dist\, a.
   Of or pertaining to the sect of Methodists; as, Methodist
   hymns; a Methodist elder.
   [1913 Webster] Methodistic

WordNet (r) 3.0 (2006):

Methodist
    adj 1: of or pertaining to or characteristic of the branch of
           Protestantism adhering to the views of Wesley; "Methodist
           theology" [syn: Methodist, Wesleyan]
    n 1: a follower of Wesleyanism as practiced by the Methodist
         Church