agen·cy 
/ˈeɪʤənsi/ noun
plural agen·cies /ˈeɪʤənsi/ noun [count] 1 : a business that provides a particular service
▪ an insurance/travel/employment agency ▪ a prominent ad agency 2 : a government department that is responsible for a particular activity, area, etc.
▪ federal law enforcement agencies ▪ the federal agency in charge of printing money ▪ various government agencies
▪ an insurance/travel/employment agency ▪ a prominent ad agency
▪ federal law enforcement agencies ▪ the federal agency in charge of printing money ▪ various government agencies
through the agency of
formal : by using the help or services of (something or someone)
▪ The treaty was ratified through the agency of a neutral country.
▪ The treaty was ratified through the agency of a neutral country.
