seven
/ˈsevən/cardinal number
1- equivalent to the sum of three and four; one more than six, or three less than ten;7七; 七个：
two sevens are fourteen
二七一十四
the remaining seven were sentenced to terms of imprisonment.
剩余七人被判监禁。
(Roman numeral: vii or VII. 罗马数字：vii或VII.)
1.1
- a group or unit of seven people or things七个人（或物）一组：
animals were offered for sacrifice in sevens.
动物以七个一组献祭。
1.2
- seven years old七岁：
my mother died when I was seven.
我七岁时母亲死了。
1.3
- seven o'clock七点钟：
the meeting doesn't finish until seven.
会议直到七点才结束。
1.4
- a size of garment or other merchandise denoted by seven（衣服等商品的）七号。
1.5
- a playing card with seven pips七点的纸牌。
1.6
sevens
seven-a-side rugby七人制橄榄球。
词源
Old English seofon, of Germanic origin; related to Dutch zeven and German sieben, from an Indo-European root shared by Latin septem and Greek hepta.