Abstract
Studies on paraphrasing are important in various research topics such as sentence generation, summarization, and question-answering. Extracting automatic paraphrases by matching definitions of the same word in two dictionaries is described. A new method for extracting these paraphrases is also described. Higher precision was obtained than with the conventional method of using frequency. Our method can be applied to other studies on paraphrase extraction. The method obtained the precision rate of 0.748in the top 500data and that of 0.222in the 500data that were extracted randomly, when a synonym only was judged as a correct answer. It obtained the precision rate of 0.954in the top 500data and that of 0.722in the 500 data that were extracted randomly, when a hypernym and a similar expression were also judged as correct answers.
