Source : Webster's Revised Unabridged Dictionary (1913)

Sectarian \Sec*ta"ri*an\, n.
   Pertaining to a sect, or to sects; peculiar to a sect;
   bigotedly attached to the tenets and interests of a
   denomination; as, sectarian principles or prejudices.

Sectarian \Sec*ta"ri*an\, n.
   One of a sect; a member or adherent of a special school,
   denomination, or religious or philosophical party; one of a
   party in religion which has separated itself from established
   church, or which holds tenets different from those of the
   prevailing denomination in a state.

   Syn: See {Heretic}.

Source : WordNet®

sectarian
     adj 1: of or relating to or characteristic of a sect or sects;
            "sectarian differences"
     2: belonging to or characteristic of a sect; "a sectarian
        mind"; "the negations of sectarian ideology"- Sidney Hook;
        "sectarian squabbles in psychology" [ant: {nonsectarian}]

sectarian
     n : a member of a sect; "most sectarians are intolerant of the
         views of any other sect" [syn: {sectary}, {sectarist}]