"apparat - structure, mechanism, etc. of an organization, especially a political one."

I need to add, that described meaning of today's word *apparat*, is only one of a few in Russian language. Other meanings (correlate with the word *apparatus*) are - engine, appliance, device, equipment, gadget, mechanism, machine.
In medicine - group of systems united to perform a specific function, e.g. *locomotor* apparat = skeleton + muscles for movement. The word might as well came directly from Latin, in addition to german route, as most scientific words, and was russianized by omitting 'us' suffix, as we usually do.

Viktor V. Trukov
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Viktor V. Trukov