Entry 1 sense Webster, 1913 Obstructionism /əb-strŭk'-shən-ĭzˌ-əm/ · Ob·struc·tion·ism · IPA /əbˈstɹʌk.ʃən.ɪz(.ə)m/ 01 n. The act or the policy of obstructing progress. 1. The act or the policy of obstructing progress.