This research examines the use of deixis in oral discourse by analyzing the interview transcript of the Head of BMKG, Dwikorita Karnawati, regarding megathrust earthquake warnings in Indonesia. Deixis is a linguistic phenomenon whose reference depends on the context of utterance, encompassing person, place, time, discourse, and social deixis. The research aims to: (1) identify types of deixis used in the interview; (2) analyze the pragmatic functions of deixis in formal institutional discourse context; and (3) explain how deixis contributes to communication effectiveness and authority construction in interviews. This research employs a qualitative descriptive method with data from a 30-minute interview transcript. Analysis was conducted using the deixis theory framework from Levinson (1983) and Yule (1996). The results show that: (1) all five types of deixis were found in the interview with high frequency: person deixis (245 times), place deixis (78 times), time deixis (62 times), discourse deixis (45 times), and social deixis (38 times); (2) person deixis is predominantly used with variations reflecting formal relationships between interviewer and interviewee; (3) place and time deixis function to concretize technical information about megathrust locations and earthquake occurrence periods; (4) discourse deixis plays an important role in creating cohesion between turns; (5) social deixis through formal address terms and pronouns contributes to authority and professionalism construction. This research contributes to understanding Indonesian pragmatics in formal institutional discourse contexts.
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