Noun

1. An organization of employees formed to bargain with the employer
2. The united states (especially the northern states during the american civil war)
3. The act of pairing a male and female for reproductive purposes
4. The state of being joined or united or linked
5. The state of being a married couple voluntarily joined for life (or until divorce)
6. Healing process involving the growing together of the edges of a wound or the growing together of broken bones
7. A political unit formed from previously independent people or organizations
8. A set containing all and only the members of two or more given sets
9. The occurrence of a uniting of separate parts
10. A device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner)
11. The act of making or becoming a single unit

Adjective

1. Of trade unions