What section of a book helps with vocabulary learning by listing definitions?

The glossary is specifically designed to aid vocabulary learning. It provides definitions for terms and concepts that are often found within the text of the book. This section is usually organized alphabetically and serves as a quick reference guide, helping readers understand unfamiliar words without disrupting their reading flow. By offering clear definitions, a glossary enhances comprehension and supports the reader's engagement with the material.

In contrast, an index is a tool that helps locate specific topics within the book, listing page numbers where those topics can be found but not providing definitions. An appendix typically contains supplementary material that elaborates on content in the main text, such as charts or additional explanations, rather than defining terms. Footnotes provide additional information or citations at the bottom of the pages but are not focused on vocabulary definitions and can vary widely in their content.