From Middle English twenty, twenti, from Old English twēntiġ, from Proto-Germanic *twaintigiwiz, *twai tigiwiz, an old compound of *twai + *teguz, equivalent to two + -ty, or twain + -ty. Cognate with Scots twenty, tuenty, West Frisian tweintich ("twenty"), Dutch twintig ("twenty"), German zwanzig ("twenty"), Danish tyve.
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