By default, your dictionary's reference libraries shown are
Apple. Obviously, you can add more references to it.
First, go to your
Dictionary Preferences Pane by either using keystrokes Command-Comma or using menu bar
Dictionary ▸ Preferences. Then you will see there are more than four default references which is available for your
You also need to pay attention that the change will take effect only after you've closed the
If you're in the mood of using your mouse, you can use keystrokes Command-Control-D to call see the definition of a word; You can see Leopard - Quick Dictionary for more details.
However, if you're not thinking of using your mouse, you can move your cursor to your browser url bar (Command-L) and then type
apple is the search term. For your surprise, your
Dictionary will be triggered.
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