Google has had a "dictionary lookup" feature for a while now -- all you had to do was slap define: before your search term. But they've now made it better, and mostly, made it easier for people to find it: Just search for a "difficult" word, and a definition would pop up as the first result, with quick links to some dictionaries.
What's interesting is that you don't get an instant definition for every word you search for as a single word: it's just the "big words". I would love to see the algorithm they use for deciding when to pop up a definition and when to stay mum.
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