This document discusses communication and definitions. It begins by defining communication and various communication models. It then discusses definitions, including categories of definitions like intensional and extensional, types of definitions like lexical and stipulative, and characteristics of good definitions. The document also covers miscommunication, including its definition, common causes like jargon and missing nonverbal cues, and effects. Finally, it discusses common languages and their benefits in facilitating understanding between groups. The overall purpose is to provide foundational information on communication and defining terms accurately to avoid miscommunication.