Abstract
This research aims to improve students' vocabulary acquisition through the strategy of deriving suffixes. The populations of this study are students from Politeknik Ganesha Medan in second semester. This research was conducted through Applied Classroom Action Research (CAR), born in two cycles (cycle 1 and cycle 2), and each process consisted of four meetings. The vocabulary test results showed that the average improvement score of the pre-test was 34.66, the post-test of period 1 was 93.46, and the post-test of period 2 was 97.33. In the first cycle, the nominal comparison rate was 88.83%, the verb nature was 77.46%, the adjective nature was 40.74%, and the adverbial heart was 84.14%. In cycle 2, the nominal comparison rate was 100%, the verb nature was 95.45%, the adjective nature was 65.84%, and the adverbial nature was 94.91%. The proportion of students who passed Minimal Criterion Mastery in each cycle was 100%, cycle 1 increased by 169.64%, and cycle 2 increased by 180.81%. These indicate that there is a significant improvement of the students’ vocabulary mastery through derivational morpheme strategy of the students of Politeknik Ganesha Medan.
Highlights
Mastering vocabulary plays a vital role in English
It is similar to Injeeli (2013), who points out that if language structure forms the backbone of language, vocabulary can provide vital organs and bodies
The test is to understand the improvement of students' vocabulary mastery after learning the affix strategy
Summary
Mastering vocabulary plays a vital role in English. It is essential to gain basic English skills (such as listening, speaking, reading, and writing). It is similar to Injeeli (2013), who points out that if language structure forms the backbone of language, vocabulary can provide vital organs and bodies. According to these statements, if students do not have a broad vocabulary, they will not speak or write anything in English. One part of vocabulary is to construct each sentence with language. It is correct because the students’ English fluency can be seen from their speech and how to use English in a meaningful way
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