Wikipedia is a multilingual "copyleft" encyclopedia designed to be read and edited by anyone. It is collaboratively edited and maintained by thousands of users via wiki software, and is hosted and supported by the non-profit Wikimedia Foundation. In addition to typical encyclopedia entries, Wikipedia includes information more often associated with almanacs, gazetteers, and specialist magazines, as well as coverage of current events.
Especially designed to suit the needs of ESL students. With an up-to-date word list and definitions adapted from The American Heritage Dictionary databases, abundant sample sentences and phrases, and an easy-to-use alphabetic pronunciation system all provide an excellent learning tool.
According to The Times, the Oxford English Dictionary is "the ultimate authority on the English language as well as a history of English speech and thought from its infancy to the present day". It is a unique source of scholarly information on the meaning, history and pronunciation of words both past and present.