This is a short video to show you the 3 finger gesture you can use on your Apple Macintosh touchpad to look up definitions of words contained with in a document.

If you do not have a touch pad you can use your mouse to replicate the same function. Simply use the mouse pointer to highlight a word. Now holding down CTRL on the keyboard, press the mouse button. This will display a menu, if you choose Look Up the definition of the highlighted word will be displayed.

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