noun
secretariat
sek-ruh-TAIR-ee-ut/ˌsekrəˈteriət/
An office or staff that handles an organization's administrative work.
The secretariat prepares meeting agendas and keeps the organization's records.

Etymology
The word names the office of a secretary, originally a confidential officer or clerk. That office supplies the connection to an organization's administrative department or staff.
In context
the head of the secretariat assists the emperor and manages all state affairs.
More examples
- Please send your registration form to the conference secretariat.
- The committee relies on its secretariat to arrange travel.
- The two secretariats share an office but serve different organizations.
Forms
secretariat · secretariats
secretary noun — A person who handles correspondence and administrative tasks.