Entry 1 sense Webster, 1913 Bilingualism /bīl-ĭng'-gwəl-ĭzˌ-əm/ · Bi·lin·gual·ism · IPA /baɪlˈɪŋɡwəlˌɪzəm/ 01 n. Quality of being bilingual. 1. Quality of being bilingual. “The bilingualism of King's English.” — Earle.