unite
US /juːˈnaɪt/
UK /juːˈnaɪt/

1.
come together for a common purpose or action
:
•
The two companies decided to unite their efforts to develop a new product.
•
The community must unite against the proposed changes.
2.
make or become a single unit
:
•
The different parts of the machine unite to form a complex system.
•
The two rivers unite downstream to form a larger waterway.