Jeon, Hyeyoung. 2014. A Sociolinguistic Study of Languages in the Medical Community. The Sociolinguistic Journal of Korea 22(3). This study aimed at exploring languages of a medical community from the sociolinguistic perspective. Based on collecting the data of languages in the medical community, the data demonstrated their language use. This study examined ways of word formation and discovered characteristics of languages in the medical community. This study conducted an interview with a medical personnel(intern) working in a hospital affiliated with university. The meanings of categorized expressions were explained and then word formations of the expressions were analyzed. As a result, there were four kinds of abbreviations in the way of word formations that are initialism, acronyms, clipping, and blending. And there were four types of complex words. Abnormal expressions, which are different from daily expressions, were also found in ways of constructing phrases and differences in usage of meaning. Implications of the characteristics unfolding through the meanings that are confined to the medical society and diverse types of word forming were discussed. This study found that three characteristics are economics from effective work performance, professionalism from need of knowledge in medical expertise, and exclusiveness from sharing a sense of belonging to exclude other groups.