Oxford English Dictionary
The historical English dictionary
An unsurpassed guide for researchers in any discipline to the meaning, history, and usage of over 500,000 words and phrases across the English-speaking world.
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What is your birthday word?
Which word entered the English language the year you were born?
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History of English
Here you can find a series of commentaries on the History of English, charting the history of the English language from Old English to the present day.