I have to take information from other website. For example from http://www.wordreference.com/enit/hello I have to get the source and parse the meaning of the word "hello" in English.

Any ideas?

don't, especially without prior permission from the site owners.
And if you get that they may well have some service you can use for it (this is the web services forum after all, not the ripping html from sites forum).

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