The phrase "entire department" refers to the whole or complete group of people who work together in a specific area or function within an organization. Full definition
Performed general office maintenance, ordered and stocked inventory for entire department. (jeffthecareercoach.com)
Keep in mind the federal government and these giant debt collection agencies have entire departments dedicated to collecting student loan debt. (gamezlawfirm.com)
Scientists at big companies don't usually worry about these issues because specialists or entire departments handle these matters. (sciencemag.org)