Oxford Dictionaries Online

Oxford Dictionaries Online is an English language online dictionary. In addition to definitions it includes synonyms and antonyms, sample sentences, audio pronunciations; writing, grammar and spelling guidance.

Oxford English Dictionary

The Oxford English Dictionary is the authority on the English language. It is a complete guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world.  The history of individual words, and of the language—traced through 3 million quotations, from classic literature and specialist periodicals to films scripts and cookery books is all available in this dictionary.