(to cause businesses, societies, groups of people) to join together

blend

to work in partnership

work together

(to cause things) to become united as one (physical) thing

combine, link

(to cause things) to become (more) solid or strong

combine; make firm

complement each other; have a relationship

equate, compare

to cause (things) to become united in one group

include, combine

(to cause business companies) to become one unit; to fade or change gradually into something

bring or come together