official
noun
a worker who holds or is invested with an office
Synonymsfunctionarysomeone who administers the rules of a game or sport
“the golfer asked for an official who could give him a ruling”
adjective
having official authority or sanction
“official permission”
“an official representative”
Oppositesunofficialof or relating to an office
“official privileges”
verified officially
“the election returns are now official”
conforming to set usage, procedure, or discipline
“in prescribed order”
Synonymsprescribed(of a church) given official status as a national or state institution
Source: WordNet 3.1, Princeton University