the act of constituting a political unity out of a number of separate states or colonies or provinces so that each member retains the management of its internal affairs
an organization formed by merging several groups or parties
a jointly owned commercial enterprise (usually organized by farmers or consumers) that produces and distributes goods and services and is run for the benefit of its owners
an association formed and operated for the benefit of those using it
done with or working with others for a common purpose or benefit; "a cooperative effort"