What does bilingualism mean?
Bilingualism is the ability to use two languages with fluency, whether by an individual speaker or across a whole community or nation. At the personal level, it describes someone who communicates comfortably in two tongues — often one learned at home and another acquired at school or later in life. At the societal level, it denotes the official recognition and parallel use of two languages, as in Canada's English–French model or Switzerland's multilingual cantons. Scholars debate where to draw the line: some reserve the term for balanced, near-native command of both languages, while others apply it to anyone who regularly uses a second language, however imperfectly. Far from being rare, bilingualism is the global norm — most of the world's population speaks more than one language. Research has linked it to cognitive flexibility and delayed onset of dementia, though such claims remain actively studied. The word derives from Latin lingua ('tongue' or 'language') via the adjective 'bilingual'.
nounThe ability to speak two languages fluently, or the habitual use of two languages by an individual speaker or within a community. In linguistics and social policy it also refers more broadly to the coexistence of two languages in a society or institution.
- The ability of an individual to use two languages fluently.
- The official or widespread use of two languages within a country, institution, or region.
"Her bilingualism opened doors throughout her career, allowing her to work comfortably in both Montreal and Madrid."
"Researchers have found that early childhood bilingualism can sharpen certain attentional skills."
"Canada's policy of official bilingualism guarantees federal services in both English and French."
Rarely pluralised. When it does occur, the plural typically distinguishes different types or models of bilingualism discussed in linguistic research rather than counting individual instances.
"The survey compared additive and subtractive bilingualisms across several immigrant communities."
More than half the world's population is thought to be bilingual — so if you speak only one language, you're actually part of the global minority.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bilingualism
Bilingualism derives from the adjective 'bilingual', formed from the Latin prefix bi- ('two') and lingua ('tongue, language'). The adjective entered English in the mid-19th century, with the noun following shortly after. It belongs to a family of Latinate terms built on lingua, including 'lingual', 'multilingual', and 'sublingual'. Cognate forms appear across the Romance languages, all tracing back to the same Latin root.
Related word forms
How bilingualism is actually used
A neutral, largely academic term used in linguistics, education, and public policy; it carries no strong connotation of formality or informality. Note that definitions vary among scholars: some require native-like fluency in both languages, while others count any regular functional use of a second language. The adjective is 'bilingual'; the adverb 'bilingually' is comparatively rare.
Easily confused with bilingualism
Diglossia refers specifically to the coexistence of two distinct varieties of a single language (such as a formal 'high' register and a colloquial 'low' one) within a community, whereas bilingualism refers to proficiency in or use of two separate languages.