organizational entity; body
Refers to any structured group or institution, such as a company, government agency, or association, viewed as a single entity.
This organizational entity was established to protect the safety of the region.
Several bodies are cooperating to advance the project.
団体 is a common word for 'group' or 'association'; 組織体 is more formal and stresses the structured, corporate nature.
Compound of 組織 (organization) and 体 (body, entity). The exact historical derivation is uncertain, but the word is a straightforward modern coinage.