In linguistics, a theoretical system that describes two related language varieties or dialects as variations within a single unified framework rather than as completely separate systems.
From Greek 'dia-' (through, across) + 'system' (arranged whole), developed in 20th-century linguistics to address how closely related dialects or languages relate to each other systematically.
Linguists use diasystems to explain why speakers of slightly different dialects understand each other perfectly even though neither speaks exactly like the other—it's like they're operating on overlapping rule systems rather than completely different languages.
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