functionary

n. official, one who holds a certain office (especially in government)

An official is someone who holds an office (function or mandate, regardless whether it carries an actual working space with it) in an organisation or government and participates in the exercise of authority (either his own or that of his superior and/or employer, public or legally private).A government official or functionary is an official who is involved in public administration or government, through either election, appointment, or employment. A bureaucrat is a member of the bureaucracy. An elected official is a person who is an official by virtue of an election. Officials may also be appointed ex officio (by virtue of another office, often in a specified capacity, such as presiding, advisory, secretary). Some official positions may be inherited.
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Noun
1. a worker who holds or is invested with an office
(synonym) official
(hypernym) skilled worker, trained worker
(hyponym) appointee
(derivation) officiate, function

(n.)
One charged with the performance of a function or office; as, a public functionary; secular functionaries.
  

FUNCTION - The occupation of an office. By the performance of its duties, the officer is said to fulfill his function.

FUNCTIONARY - One who is in office or in some public employment.