Vocabulary mastery is an important part of learning English, especially in learning a text. Students who have good vocabulary mastery can understand texts more easily. Therefore, vocabulary mastery is crucial in supporting students when reading texts. This study aims to describe the vocabulary mastery of second semester students in the English Language Education Department of Universitas Ekasakti and to identify the most difficult aspects of vocabulary faced by these students. The research employed a descriptive quantitative design. The population of this research consisted the second semester students of the English Language Education Department. The sample were 13 students selected by using total sampling. The research instrument was a vocabulary test. The instrument used in this research was a multiple-choice vocabulary mastery test consisting of 40 items. The collected data were analyzed by calculating the students’ scores, mean score, and percentage. The results revealed that the students’ vocabulary mastery was categorized as High (72.1). The percentage scores of students' vocabulary mastery were distributed as follows: 30.77% (4 students) were categorized as Very High, 53.85% (7 students) as High, and 15.38% (2 students) as Moderate. No students were classified in the Low or Very Low categories. However, further analysis by vocabulary aspects showed that students experienced the greatest difficulty in the word class aspect. In contrast, the aspects of form-meaning connection and concept referents were found to be less challenging for the students.
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