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See glossaries and definitions in Books on Mac
If you’re reading an interactive book that has a glossary, you can look up the glossary entries.
See a book’s glossary
- Go to the Books app  on your Mac. on your Mac.
- Click Books (or another collection) below Library in the sidebar. 
- Double-click an interactive book that has a glossary. 
- Move the pointer to the top of the page, then click  (or choose View > Show Glossary). (or choose View > Show Glossary).- If the book doesn’t have a glossary, the command is dimmed. 
- Click a glossary term. 
See a word’s definition and other information
Control-click the word, then choose Look Up. See Look up words.