Unite (verb)

1. Join together as one.
2. Bring together to form a whole.
3. Combine or merge.

Origin:

Late middle english: from old french unir, from latin unire, from unus "one".

Examples:

1. The countries united to form a federation.
2. The workers united to form a union.
3. The two companies united to form a larger company.
4. The organization is trying to unite the community.
5. The couple decided to unite their families.