What is the primary purpose of a glossary in a book?

The primary purpose of a glossary in a book is to define specialized terms. A glossary typically contains a list of words or phrases specific to the subject matter of the book along with their definitions. This is particularly helpful in textbooks or academic works where the use of specialized vocabulary is common. By providing definitions, a glossary enables readers to understand these terms more clearly, which enhances comprehension of the content. This function is essential in educational materials, where understanding precise terminology is critical for grasping concepts presented in the text.

While glossaries may also aid in offering additional information, summarizing key concepts, or indexing topics, their main role is specifically to clarify and define the terms used, ensuring that readers can follow the author's intentions without confusion over jargon or technical language.