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For more than 150 years, in print and now online, Merriam-Webster has been America's leading and most-trusted provider of language information providing now an online dictionary and thesaurus.
The online etymology dictionary is the internet's go-to source for quick and reliable accounts of the origin and history of English words, phrases, and idioms.
Summary: An English dictionary, featuring alphabetically arranged entries that encompass over 240,000 words, phrases, and definitions. In print through its various editions for a century, the Concise Oxford English Dictionaryis one of the most popular choices in Oxford's renowned dictionary line, selected by decades of users for its up-to-date and authoritative coverage of the English language.
Concise Oxford English Dictionary by 
The New Oxford American Dictionary by 