Noun
1. an organization of employees formed to bargain with the employer;
"you have to join the union in order to get a job"2. the act of pairing a male and female for reproductive purposes;
"the casual couplings of adolescents""the mating of some species occurs only in the spring"3. the state of being joined or united or linked;
"there is strength in union"4. the state of being a married couple voluntarily joined for life (or until divorce);
"a long and happy marriage""God bless this union"5. healing process involving the growing together of the edges of a wound or the growing together of broken bones
6. a political unit formed from previously independent people or organizations;
"the Soviet Union"7. a set containing all and only the members of two or more given sets;
"let C be the union of the sets A and B"8. the occurrence of a uniting of separate parts;
"lightning produced an unusual union of the metals"9. a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner)
10. the act of making or becoming a single unit;
"the union of opposing factions""he looked forward to the unification of his family for the holidays"