Source : Webster's Revised Unabridged Dictionary (1913)

Dissenter \Dis*sent"er\, n.
   1. One who dissents; one who differs in opinion, or declares
      his disagreement.

   2. (Eccl.) One who separates from the service and worship of
      an established church; especially, one who disputes the
      authority or tenets of the Church of England; a
      nonconformist.

            Dissenters from the establishment of their several
            countries.                            --Burke.

            Robert Brown is said to have the first formal
            dissenter.                            --Shipley.

   Note: ``The word is commonly applied only to Protestants. The
         Roman Catholics are generally referred to as a distinct
         class.'' --Brande & C.

Source : WordNet®

dissenter
     n : a person who dissents from some established policy [syn: {dissident},
          {protester}, {objector}, {contestant}]