Entry 1 sense Webster, 1913 Experimentally /ĭk-spĕrˌ-əm-ĕn'-təl-ē/ · Ex·per·i·men·tal·ly · IPA /ɪkspˌɛrəmˈɛntəliː/ 01 adv. By experiment; by experience or trial. 1. By experiment; by experience or trial.