An official representative.
An official banquet.
An official request.
An official welcome to the city.
The official date of publication.
An example of an official document is a certified birth certificate.
An example of an official person is a city planner.
An official statement or report.
An official drug or preparation.
David Barnes was the official charged with the running of the sports club.
In most football games there are three officials: the referee and two linesmen.