The document discusses the importance of understanding medical terminology and semantics. It states that in the medical field, each term has a fixed meaning and misunderstanding terms can lead to misconceptions that endanger patient care. It emphasizes learning terms through their precise definitions from a medical dictionary to understand their exact meanings in context. It then provides examples looking up definitions for various medical terms like Sclera, Purkinje Cell, Perimysium, and Paramecium to illustrate finding the precise meanings of terms.