Abstract
This paper discusses about one of strategies in teaching English vocabulary; that is through Concept Definition Map. Concept Definition Map is an instructional strategy which used to teach the students about the concept of a keyword that they knew before. This strategy helps the students to find a new concept of the word by filling out some instructions in accordance with the graphic provided by the teacher. The students are asked to re-call their knowledge about the word until they find a new concept in more detail about it. This strategy is very suitable for learning vocabulary through reading activity; besides learn about a text, the students can also increase their knowledge deeply about the concept of words. Therefore, by implementing this strategy it is expected that the vocabulary knowledge of the students can grow easily.