n.

1. 结合；合并[U][S]；合而为一
   We are working for the union of the two countries.

   我们正为这两国的合并而努力。

2. 和谐；一致[U]
   All the nationalities live together in perfect union.

   各族人民非常和睦地生活在一起。

3. 联邦，联盟[C]
4. 工会；联合会，协会[C][G]
   He was compelled to join the union as a condition of getting the job.

   作为获得该工作的先决条件，他被迫加入了工会。

5. （大写）美国；英国[the S]
6. 结合；结婚[C][U]
7. （常大写，用于名称中）（大学的）学生自治会，会社，社团[C][G]
8. 【数】并集

n.

1. the action or fact of uniting or being united.
   ▸a state of harmony or agreement.
   ▸a marriage.
   ▸ (the Union) the uniting of the English and Scottish crowns in 1603, of the English and Scottish parliaments in 1707, or of the parliaments of Great Britain and Ireland in 1801.
2. a society or association formed by people with a common interest or purpose, especially a trade union.
3. (also Union) a political unit consisting of a number of states or provinces with the same central government, especially the US.
   ▸ (the Union) the northern states of the US in the American Civil War.
4. Mathematics  the set that comprises all the elements (and no others) contained in any of two or more given sets.
5. a joint or coupling for pipes.
6. a part of a flag with an emblem symbolizing national union, normally in the upper corner next to the staff.
7. a fabric made of different yarns, typically cotton and linen or silk.
8. Brit. historical a number of parishes consolidated for administering the Poor Laws.