Question

What is diglossia?

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Answer

A situation in which a community uses two distinct varieties of the same language for different purposes, with a clear division between a formal "high" variety and an everyday "low" one — and crucially, neither is anyone's casual choice.

The defining features, as set out by Charles Ferguson:

Functional separation. The high variety is used for writing, education, religion, broadcasting, formal speech and literature. The low variety is used for conversation, family life and informal settings. Using the wrong one is socially marked — the high variety in casual conversation sounds absurd; the low variety in a formal context is inappropriate.

The high variety is not spoken natively by anyone. It is acquired through formal education, not at home. Everyone learns the low variety first, as their mother tongue.

Prestige attaches strongly to the high variety, which is frequently regarded as more correct, more beautiful and more logical — including by speakers whose own everyday speech is the low variety.

A body of literature exists in the high variety, frequently including a religious text that anchors its status.

Standardisation is far stronger for the high variety, with grammars and dictionaries.

The classic examples: the Arabic-speaking world, where Modern Standard Arabic functions as the high variety across many countries while distinct regional dialects are spoken at home; Greek before reform, with Katharevousa and Demotic; and Swiss German, where Standard German is written and Swiss German varieties are spoken.

Why it is more than bilingualism. In bilingualism the varieties are separate languages and speakers may use either freely. In diglossia the two varieties are related, the division of function is rigid, and the speaker has no real choice about which to use in a given setting.

Extended diglossia describes the same pattern with unrelated languages — a colonial language for administration alongside local languages at home, a situation that persists widely.

Why it matters practically: children are educated in a variety they do not speak at home, which has measurable effects on literacy attainment and is a recognised educational challenge.

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