Definition of "Union" :

noun: the act of making or becoming a single unit

"The union of opposing factions."

noun: the act of pairing a male and female for reproductive purposes

noun: a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner)

noun: the occurrence of a uniting of separate parts

"Lightning produced an unusual union of the metals."

noun: 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."

noun: an organization of employees formed to bargain with the employer

"You have to join the union in order to get a job."

noun: a political unit formed from previously independent people or organizations

"The Soviet Union."

noun: the United States (especially the northern states during the American Civil War)

"He has visited every state in the Union."

noun: healing process involving the growing together of the edges of a wound or the growing together of broken bones

noun: the state of being a married couple voluntarily joined for life (or until divorce)

"God bless this union."

noun: the state of being joined or united or linked

"There is strength in union."

adjective: being of or having to do with the northern United States and those loyal to the Union during the American Civil War

"Union soldiers."

adjective: of trade unions

"The union movement."