Three-Fingered Tap on a Word Summons a Dictionary & Wikipedia in OS X Lion
Applying a three-fingered tap on any word in a Mac OS X 10.7 Lion native apps brings up a pop-up dictionary, thesaurus, and even a Wikipedia entry on that word. If the summary isn’t enough information, you can select to read more directly from the QuickLook-esque popup.
This is a students dream, but it should be useful to anyone reading things on the web or elsewhere when they run into a word they want some more information on, whether it be just a simple definition or the entire Wikipedia backed entry on a topic. Yet another reason to upgrade to Lion.
Encyclopedic pop-ups appear to work on any Mac with a multitouch trackpad and in all native Lion Cocoa apps – Safari, TextEdit, Pages, etc – it’s probably an OS-level feature that developers can include in their apps too.