Other forms: twenties
Twenty is two times ten. The point where English counting settles into a pattern.
Everything below it has its own name, and everything above follows a rule, which is why children learn to count to twenty first. A score is an old word for twenty and survives in the famous opening four score and seven years ago. Britain counted money in twenty shillings to the pound until 1971. Twenty-twenty vision means perfect eyesight, and it is a measurement rather than a metaphor.
1nountwentyThe number equal to two times ten.
“There were about twenty people waiting.”
Proto-Germanic
*twaintigiwiz
Old English
twēntiġ — twenty
Middle English
twenty
English, today
twenty
From Middle English twenty, twenti, from Old English twēntiġ (“twenty”) literally “two tens”, from Proto-Germanic twaintigiwiz, twai tigiwiz, an old compound of twain- + -tigaz, equivalent to two + -ty, or twain + -ty. Cognate with Scots twenty, tuenty (“twenty”), West Frisian tweintich (“twenty”), Dutch twintig (“twenty”), German zwanzig (“twenty”), Danish tyve.
Etymology from Wiktionary, CC BY-SA