Source : Webster's Revised Unabridged Dictionary (1913)

Presbyterian \Pres`by*te"ri*an\, a. [Cf. F. presbyt['e]rien.]
   Of or pertaining to a presbyter, or to ecclesiastical
   government by presbyters; relating to those who uphold church
   government by presbyters; also, to the doctrine, discipline,
   and worship of a communion so governed.

Presbyterian \Pres`by*te"ri*an\, n. [Cf. F. presbyt['e]rien.]
   One who maintains the validity of ordination and government
   by presbyters; a member of the Presbyterian church.

   {Reformed Presbyterians}. See {Cameronian}.

Source : WordNet®

Presbyterian
     n : a follower of Calvinism as taught in the Presbyterian Church