Entry 1 sense Webster, 1913 Wagnerian /wăgˌ-nĕr'-ē-ən/ · Wag·ne·ri·an · IPA /wˌæɡnˈɛriːən/ 01 a. Of, pertaining to, or resembling the style of, Richard Wagner, the German musical composer. 1. Of, pertaining to, or resembling the style of, Richard Wagner, the German musical composer.