Diglossia is a situation in Intro to Linguistics where one speech community uses two varieties of a language for different purposes, usually a formal High variety and an everyday Low variety.
Diglossia is a language situation where one community regularly uses two distinct varieties of the same language, and each variety has a different social job. In Intro to Linguistics, you usually see it described as a High variety, used for school, government, religion, or formal writing, and a Low variety, used in conversation at home or with friends.
The big idea is not just that two varieties exist, but that people expect them to be used in different settings. A speaker may use the High variety in a speech, then switch to the Low variety in a market or a text message. That division can feel so normal that speakers treat it as the natural way the language works.
A classic example is Arabic, where Modern Standard Arabic often serves as the High variety and regional dialects serve as Low varieties. The High variety may be the one you see in news broadcasts, textbooks, and formal speeches, while the Low variety is the one people actually use in daily conversation. The two varieties can be closely related, but they are not interchangeable.
Diglossia matters because it changes how language feels in real life. If you only know the Low variety, you may understand everyday conversation but struggle with school reading or formal writing. If you only know the High variety, you may sound stiff or distant in casual interaction. That gap can affect literacy, schooling, and social identity.
One thing to keep straight is that diglossia is about functional split, not just multilingualism in general. A community can be multilingual without diglossia, and diglossia can involve two varieties of one language rather than two totally separate languages. In sociolinguistics, that distinction helps you describe how speakers match language choice to place, audience, and purpose.
Diglossia shows how language variation is tied to power, education, and social life, not just grammar. In Intro to Linguistics, it gives you a way to explain why the form of language used in school or official settings can feel very different from the form people use at home.
It also helps you read real language situations more carefully. If a community has a High variety with prestige and a Low variety for everyday speech, then differences in literacy, classroom performance, or public speech are not just about ability. They can reflect which variety a speaker has been exposed to first and which one carries social status.
Diglossia connects directly to language contact and multilingualism because it shows what happens when a community manages more than one code. It can also overlap with dialect variation, code choice, and language attitude. When you see a case study about language policy, schooling, or media, diglossia gives you a clean frame for asking who gets to use which variety, where, and why.
Keep studying Intro to Linguistics Unit 9
Visual cheatsheet
view galleryCode-switching
Code-switching is what speakers may do inside a diglossic community when they move between the High and Low varieties based on topic, audience, or setting. Diglossia describes the stable social split between varieties, while code-switching describes the actual act of shifting from one code to another. A speaker can code-switch within one conversation because the community has diglossic expectations.
Bilingualism
Bilingualism means knowing and using two languages or varieties, but diglossia is narrower because it focuses on their different social functions. A person can be bilingual without living in a diglossic society, and a diglossic society can exist even when people think of the varieties as one language with two forms. The overlap matters in classroom cases about language use and identity.
Language register
Language register is about choosing a style that fits a situation, such as formal, casual, academic, or intimate speech. Diglossia is a stronger pattern than register because the split is built into the speech community and tied to social expectations. If you are analyzing a formal speech versus a home conversation, register helps explain style, while diglossia explains the larger system behind that choice.
Dialectal and social variation
Diglossia is one kind of dialectal and social variation, but it is more structured than ordinary regional differences. A dialect may vary by region or class without a fixed High and Low division, while diglossia assigns different social domains to each variety. That makes it a useful example when you are tracing how social hierarchy shows up in language form.
A quiz question might give you a language community and ask you to identify whether the situation is diglossic. Look for two varieties with different jobs, not just two accents or two separate languages. If the formal variety shows up in writing, school, or religion and the informal variety shows up in everyday conversation, that is your clue.
On short answer and discussion prompts, you may be asked to explain how diglossia affects literacy, social status, or language attitudes. The best response names the High and Low varieties, then connects them to a real setting such as classrooms, media, or family speech. If a passage describes people switching varieties depending on context, diglossia is usually part of the explanation.
Bilingualism means a speaker or community uses two languages. Diglossia means those varieties have different social roles, with one used for formal situations and the other for everyday life. A bilingual community is not always diglossic, and a diglossic community is not always best described as simply bilingual.
Diglossia is a split between two language varieties in one speech community, not just a random mix of speech styles.
The High variety usually carries prestige and shows up in formal settings like school, religion, government, or writing.
The Low variety is the everyday form people use at home, with friends, or in casual conversation.
Diglossia can affect literacy and school performance because learners may speak one variety at home and read or write in another.
When you see a community using different forms for different settings, ask whether the pattern is diglossia, code-switching, or just general register change.
Diglossia is a situation where one speech community uses two varieties of a language for different purposes. The High variety is linked to formal settings, while the Low variety is used in everyday conversation. It is a sociolinguistic pattern, so the social roles of the varieties matter as much as the language forms themselves.
Bilingualism means using two languages or varieties, but it does not always involve a stable social split. Diglossia is about function: one variety is expected in formal domains and the other in informal ones. A community can be bilingual without diglossia, and a diglossic society can exist even when the two varieties are closely related.
Arabic is the classic example often used in linguistics classes. Modern Standard Arabic is associated with formal writing, broadcasting, and education, while regional dialects are used in everyday speech. That division shows how two varieties can coexist with different social jobs.
Diglossia can make school feel like a switch into a different linguistic code, especially if the High variety is the one used in textbooks and formal assessment. Learners may speak the Low variety at home but need the High variety for reading, writing, and class discussion. That gap can shape literacy and confidence in the classroom.