or Dis·es·tab·lish·men·tar·i·an D0266600 (dĭs′ĭ-stăb′lĭsh-mən-târ′ē-ən)n. An opponent of an established order, especially one who opposes state support of an established church.dis′es·tab′lish·men·tar′i·an adj.dis′es·tab′lish·men·tar′i·an·ism n.ThesaurusSeedisestablishment