fortnight
/ˈfɔːtnaɪt/noun
1- chiefly Brit. a period of two weeks〈主英〉两星期。
1.1
- informal used after the name of a day to indicate that something will take place two weeks after that day〈非正式〉两星期后（用于日期后表示两星期后发生）。
词源
Old English fēowertīene niht 'fourteen nights'.