An acronym is a shortening formed from a combination of letters pronounced as a natural word. This study aims to describe the form, meaning, and social function of acronyms used in TikTok captions. This study uses a qualitative descriptive method with a sociolinguistic approach. Data in the form of captions on TikTok containing acronyms was collected through screenshot techniques and note-taking techniques. Data is analyzed through the stages of data reduction, data presentation, and conclusion drawn. The results of the study show that there are 84 acronym data. Based on the theory of the formation of acronyms according to Kridalaksana which totals 16, in this study only 13 forms were found, namely, the first quarter of the component, the first quarter of the first component and the whole word, the last quarter of the component, the first quarter of the first component of the second and the first letter of the next component, the first two letters of the component, the first three letters of the component, the first two letters of the first component and the first three letters of the second component accompanied by conjunctions, the first two letters of the first third component as well as the first three letters of the second component, the first three letters of the first and third components and the first letter of the second component, the first two letters of the first component and the first three letters of the second component, the first four letters of the first component and the first three letters of the second component, and various letters are difficult to formulate. This study found that acronyms have meanings that are adjusted to the context of using TikTok captions. This research also has several social functions, namely as language efficiency, facilitation of communication, memory improvement, social identity formation, and elements of aesthetics and humor.
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