Here's a quick way to translate text directly from Google Search. Type the language pair, followed by the text you want to translate. For example, to translate "I love you" in French, search Google for: [en:fr love]. You can also type [translate love in french], but this query is longer.
For now, this feature only works for language pairs that include English: en:fr, fr:en (French), en:it, it:en (Italian), en:de, de:en (German), en:es, es:en (Spanish), en:ru, ru:en (Russian), en:zh, zh:en (Chinese), en:ja, ja:en (Japanese), en:ko, ko:en (Korean).
If you use the language pair en:en (English to English), Google shows definitions from Google Dictionary. For example, a search for [en:en astute] shows the definition of the word "astute" and the pronunciation. Google Dictionary uses definitions from Collins COBUILD Advanced Learner's English Dictionary.
You can also search for [astute definition], but the OneBox result shows definitions from WordNet.