<![CDATA[This study is motivated by the diversity of regional languages used in social interactions at SMA Negeri 1 Sungai Aur. This diversity is influenced by the linguistic backgrounds of school community members, including speakers of Malay, Mandailing, and Javanese. The use of regional languages serves not only as a means of communication but also reflects social relationships among speakers. This study aims to describe the types of regional language variation and the meanings associated with their use in social interactions among the school community. This qualitative study employed a descriptive method. The data consisted of utterances collected through observation, listening, recording, and note-taking techniques involving students, teachers, and educational staff. Five informants were selected based on the research requirements. Data validity was established through technique triangulation, while data were analyzed using the interactive model of Miles and Huberman, consisting of data reduction, data display, and conclusion drawing and verification. The results revealed three types of regional language variation: variations based on speakers, usage, and formality. Speaker-based variations were reflected in the use of Malay, Mandailing, and Javanese, influenced by the speakers’ linguistic backgrounds. Usage-based variations occurred in transactions, food and beverage ordering, services, and information delivery in the school canteen. Formality-based variations were characterized by simple and spontaneous language in informal situations, classified as casual speech. In terms of meaning, the study identified lexical, referential, and conceptual meanings in the utterances.]]>
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