Source : Webster's Revised Unabridged Dictionary (1913)

Conformist \Con*form"ist\, n.
   One who conforms or complies; esp., one who conforms to the
   Church of England, or to the Established Church, as
   distinguished from a {dissenter} or {nonconformist}.

         A cheeful conformist to your judgment.   --Jer.Taylor.

Source : WordNet®

conformist
     adj 1: marked by conformity or convention; not corresponding to
            current customs or rules or styles; "underneath the
            radical image teenagers are surprisingly conformist"
            [ant: {nonconformist}]
     2: adhering to established customs or doctrines (especially in
        religion) [syn: {conforming}]
     n : someone who conforms to established standards of conduct
         (especially in religious matters) [ant: {nonconformist}]