twenty

• n. 20代目；20代目
• num.
• adj.

2、2、-ty、10、語源的には10と同じ。

twenty

twenty: [OE] Twenty is etymologically ‘two tens’. The second syllable, -ty, is related to ten, and twen- goes back to the same source as two, although its precise ancestry is not clear.
=> ten, two

twenty (n.)

Old English twentig "group of twenty," from twegen "two" (see two) + -tig "group of ten" (see -ty (1)). Cognate with Old Saxon twentig , Old Frisian twintich, Dutch twintig, Old High German zweinzug, German zwanzig. Gothic twai tigjus is even more transparent: literally "two tens."

The card game twenty-one (1790) is from French vingt-et-un (1781). Twenty-twenty hindsight is first recorded 1962, a figurative use of the Snellen fraction for normal visual acuity, expressed in feet. The guessing game of twenty questions is recorded from 1786.

1. Brian counted to twenty and lifted his binoculars.Elena did the same.

ブライアンは20まで数え、双眼鏡を持ち上げた。エレナもその通りにしました。

2.By the time he 's twenty he 'll know everyone worth knowing in Washington.

20歳になると、ワシントンのすべての認識すべき人を認識するようになる。

3.Take a hundred and twenty values and calculate the mean.

120個の値を用いて平均数を計算する。

4.Southbound traffic tailed back for twenty miles on the M 5 near Bristol.

ブリストル近くの5番高速道路では、南行の車両が20マイルも続く長蛇の列になっていた。

5.The agent spied for East Germany for more than twenty years.

この工作員は東ドイツのために20年以上スパイをしてきた。