noun

1. UNION, the act of making or becoming a single unit
2. UNION, the act of pairing a male and female for reproductive purposes
3. UNION, a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner)
4. UNION, the occurrence of a uniting of separate parts
5. UNION, a set containing all and only the members of two or more given sets
6. UNION, an organization of employees formed to bargain with the employer
7. UNION, a political unit formed from previously independent people or organizations
8. UNION, the United States (especially the northern states during the American Civil War)
9. UNION, healing process involving the growing together of the edges of a wound or the growing together of broken bones
10. UNION, the state of being a married couple voluntarily joined for life (or until divorce)
11. UNION, the state of being joined or united or linked
12. UNION, an organization of workers formed to protect the rights and interests of its members
13. UNION, an act of joining two or more things together
14. UNION, a group of states or nations that are ruled by one government or that agree to work together

adjective

1. UNION, being of or having to do with the northern United States and those loyal to the Union during the American Civil War

adjective

1. UNION, of trade unions

1. She joined the teachers' union.
2. An embryo is created through the union of sperm and egg.
3. a perfect union of Eastern and Western music