| noun | an organization of employees formed to bargain with the employer “you have to join the union in order to get a job” |
| noun | the United States (especially the northern states during the American Civil War) “he has visited every state in the Union” |
| noun | the act of pairing a male and female for reproductive purposes “the casual couplings of adolescents” |
| noun | the state of being joined or united or linked “there is strength in union” |
| noun | the state of being a married couple voluntarily joined for life (or until divorce) “a long and happy marriage” |
| noun | healing process involving the growing together of the edges of a wound or the growing together of broken bones |
| noun | a political unit formed from previously independent people or organizations “the Soviet Union” |
| 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 | the occurrence of a uniting of separate parts “lightning produced an unusual union of the metals” |
| noun | a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner) |
| noun | the act of making or becoming a single unit “the union of opposing factions” |
| 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” |
| unionize | verb | recruit for a union or organize into a union |
| trade unionist | noun | a worker who belongs to a trade union |
| couple | verb | engage in sexual intercourse |
| mate | verb | engage in sexual intercourse |
| pair | verb | engage in sexual intercourse |
| conjugate | verb | undergo conjugation |
| matrimonial | adjective | of or relating to the state of marriage |
| conglutinate | verb | cause to adhere |
| unite | verb | become one |
| unify | verb | act in concert or unite in a common purpose or belief |
| join | verb | be or become joined or united or linked |
| Federal | noun | a member of the Union Army during the American Civil War |