The Oxford Thesaurus An A-Z Dictionary of Synonyms - dissident n.

1) dissenter, nonconformist, protester or protestor, heretic, rebel, apostate, recusant; revolutionary: Many dissidents were released and allowed to leave the country. --adj. 2) disagreeing, nonconformist, nonconforming, dissenting, dissentient, apostate, non-compliant, heterodox, discordant, conflicting, contentious: The couple spent ten years in Siberia for promoting their dissident philosophy.