how can I enable in Preview.app the three fingers gesture that shows the selected word in the dictionary?
This gesture works great in Mail.app but doesn't in Preview.app
Three fingers gestures in Preview App
multi-touchpreview
Related Solutions
It is possible to disable the gestures in the preferences. Sometimes a reboot is needed if other things are going wrong, but on most macs the change is immediate.
This annoyed me too, and it doesn't seem the solution is entirely satisfying — we'll just have to hope that Twitter for Mac gets updated soon to be better compatible with Lion.
If you have "Swipe between pages" set to "Swipe left or right with three fingers" or "Swipe with two or three fingers", then left/right three-finger swipe gestures will work in Twitter.
If you have Mission Control & App Exposé set to "Swipe up/down with three fingers", then you can hold ⌥ Option to use up/down three-finger swipe gestures with Twitter. (I'm not sure why, but if you have these set to 4-finger swipes, it doesn't seem 3-finger swipes work at all in Twitter.)
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Best Answer
Are you viewing a PDF? Unfortunately, the three finger tap gesture does not work with PDF files across the system (e.g. not in Safari as well).
The most convenient alternative I can think of is double tapping a word to select it and then two-finger tapping on that word to show the context menu in which you find the command "Look up word in dictionary".