This is a direct link to the raw wikipedia data dump, roughly 7TB uncompressed. The data is bz2, gz, and 7z compressed and in .xml format. A higher level view of the data is available at this link: http://dumps.wikimedia.org/

As explained on this page: http://en.wikipedia.org/wiki/Wikipedia:Database_download, downloading data of this size uses a lot of bandwidth, which costs the Wikipedia Foundation lot’s of money. See further details at that link for how you might find other ways to grab the content.

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