The document discusses different ways to define the meaning of words and concepts. It describes definitions as being either real or nominal. Real definitions aim to describe the inherent nature or essence of something, while nominal definitions describe the meaning of a word. Common methods of defining include definition by ostension (pointing), synonymy (using synonyms), context/exemplars, and genus and differentia (specifying a broader class and distinguishing features). The relationship between words, meanings, and definitions is complex, as meaning can vary based on context and combination with other words.