My degree (German and Spanish) starts next week and after experimenting I have found that Siri can give you translations to words, without having to open up a web page.
Ask Siri for example: "what is the Spanish word for party" and it will give you not only the obvious "siesta" (as in a party with music - ie, entertainment) but also "grupo" (a party of people), "partido" (a political party), and "celebrar" (a celebration).
This will come in so handy ...
Would be better if it would say the word rather than just show the text. That would be sweet.