the act of combining things to form a new whole

unite into one

bring together into a single whole or system

the act of consolidating power under a central control

consolidating two or more things; union in (or into) one body

the combination of two or more commercial companies

absorption into a single firm of several firms involved in all aspects of a product's manufacture from raw materials to distribution

absorption into a single firm of several firms involved in the same level of production and sharing resources at that level