1) (to cause businesses, societies, groups of people) to join together (amalgamate)
2) (to cause things) to join together (combine)
3) (to cause machine parts etc) to lock or join together (interlock)
4) to join together (rope, film, recording tape etc) (splice)
(to cause businesses, societies, groups of people) to join together
blend
to work in partnership
work together
(to cause states, organizations, societies) to unite into a federation
ally
