Google will provide the definition for any word it knows, as long as you ask nicely (just typing "define" usually gets the job done). For anyone who doesn't get what I mean, here's an example.
As an English speaker, this functionality is just something I take for granted. But like everything else, it takes time to expand this out to other languages. Now Google's drawn attention to the feature's availability in Spanish.

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Google Search Will Now Define Spanish Words For People Who Google Using Spanish Settings was written by the awesome team at Android Police.