CHAPTER II REVIEW OF RELATED LITERATURE
This chapter explains about theoretical description and theoretical framework of the research. Definition of terms, which is discussed in the previous
chapter, will be discussed deeper in this chapter. Literature review that can support this research is mentioned and explained in the theoretical description.
2.1 Theoretical Description
The mastery of vocabulary of the senior high school students is one of the indicators in learning English as a foreign language since vocabulary is a key for
the learners to be able to communicate with the others well using the language learned. There are theories that can support this study. The theories will be
explained below.
2.1.1 Definition of Vocabulary
Vocabulary is one of important supporting elements in language learning. It can be said as a significant part of communication and it is the key to be able to
master the language well Dale and O’Rourke, 1971: 6. This section will discuss the complete definition of vocabulary as follows.
9 PLAGIAT MERUPAKAN TINDAKAN TIDAK TERPUJI
2.1.1.1 Vocabulary Knowledge
Vocabulary knowledge means the knowledge in which the learners learn about the words, meaning of words, and how to use the words in the sentences
when somebody is learning English, especially English as a foreign language. According to Young 2007, vocabulary is a study of the word meanings, how to
use the words, and root words and the affixes. In other words, vocabulary does not only learn about the meaning of the words, but also the use of the words in
different context. The students need to realize that vocabulary is an index of the nature and quality of their lives. Words can reflect what they have studied Dale
and O’Rourke, 1971: 9. The people who are learning vocabulary have strong relation with the
reading comprehension Lehr, 2001. The learners get more knowledge of vocabulary from many reading materials. The learners should read many kinds of
readings in different difficulty level. By reading a lot of different level in words’ difficulty, the learners will have more understanding of the meaning of words and
their function in different context. Reading is not only one of the English skills that can help the learners in improving their knowledge of vocabulary. Through
listening to many passages, the learners can also learn many words and the meanings. In learning vocabulary, there are words families and core meaning.
When the learners are learning a foreign language, such as English, they will learn word families and core meaning. According to Nunan 2003 word
families are the basic words added by plural form, present tense, past tense, etc. for example: the word “fan” become “fan, fans” and “walk” become “walk, walks,
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