Old English
US /ˌoʊld ˈɪŋ.ɡlɪʃ/
UK /ˌoʊld ˈɪŋ.ɡlɪʃ/

1.
the English language from the 5th to the 11th century, a period of full inflections and a largely Germanic vocabulary, from which modern English developed
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Many modern English words have their roots in Old English.
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Studying Old English can provide insights into the history of the language.