1. 联盟；同盟
    A league is a group of people, clubs, or countries that have joined together for a particular purpose, or because they share a common interest.

    e.g. ...the League of Nations.
           国际联盟
    e.g. ...the World Muslim League.
           世界穆斯林联盟

2. （体育运动队的）联合会，联赛
    A league is a group of teams that play the same sport or activity against each other.

league什么意思

    e.g. ...the American League series between the Boston Red Sox and World Champion Oakland Athletics...
           波士顿红袜队和世界大赛冠军奥克兰运动家队的美国联盟冠军赛对决
    e.g. The club are on the brink of promotion to the Premier League.
           俱乐部即将晋级超级联赛。

3. 级别；档次；水平
    You use the word league to make comparisons between different people or things, especially in terms of their quality.

    e.g. Her success has taken her out of my league...
           她的成绩令我望尘莫及。
    e.g. Their record sales would put them in the same league as The Rolling Stones.
           他们的唱片销量可与“滚石”乐队比肩。

4. 沆瀣一气；勾结
    If you say that someone is in league with another person to do something bad, you mean that they are working together to do that thing.

    e.g. There is no evidence that the broker was in league with the fraudulent vendor...
           没有证据表明该经纪人与进行诈骗的卖主狼狈为奸。
    e.g. Williams operated the smuggling scheme in league with his brother.
           威廉斯串通其弟进行走私活动。