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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.
In the Books app
on your Mac, click Library in the toolbar.
Double-click an interactive book that has a glossary.
Choose View > Show Glossary.
If the book doesn’t have a glossary, the command is dimmed.
Click a glossary term.
To quickly see the definition of a word, just double-click it. You can also select the word, then choose Look Up, Search Book, Search Web or Search Wikipedia. See Look up words.
See alsoUse study cards in Books on Mac