purism       
noun [ U ] uk/ˈpjʊə.rɪ.zəm/ us/ˈpjʊr.ɪ.zəm/
 正统主义;纯粹主义
the fact of believing in and following very traditional rules or ideas in a subject
  The school had an emphasis on modernism and purism in design. 学校在设计上强调现代主义和纯粹主义。 
 He has made a lifelong pursuit of purism in music.  他毕生追求音乐的纯粹主义。 
 See: purist
 - More examples
 - Dylan chafed at the folk movement's ideological purism.
 - Her style flattens everything in the interest of geometric and linear purism.
 - He was steeped in the strict purism of the modernist school of architecture.