Union (noun)

1. An act or instance of uniting or joining two or more things into one.
2. The state of being united or joined.
3. A body of individuals having a common interest, formed to promote their rights and interests.
4. A political unit formed from separate states or countries.
5. A trade union, labor union, or other workers' organization.

Origin:

Middle english, from latin uniō, uniōn-, from unire to unite.

Examples:

1. The merger created a union of two companies.
2. The union of their talents made for a great team.
3. The union represents workers in negotiations with management.
4. The European Union is a political and economic union of 27 European countries.
5. The teacher's union went on strike for better pay and working conditions.