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supraorganization

n. An organization whose members are themselves organizations

Wikipedia
Supraorganization

A supraorganization is an organization whose members or stakeholders are organizations rather than individuals and which performs an over-arching function.

Some organizations may have membership of both organizations and individuals. These are usually described as " federations". " Coalitions", " networks", " confederations", and " unions" are also terms that are sometimes used, although these are just as frequently used to refer to organizations composed of individuals.

The term is also used in microbiology.