official

adj

1. Of or about an office or public trust.

   “official duties”

2. Derived from the proper office or officer, or the appropriate authority; made or communicated by authority

   “an official statement or report”

3. Approved by authority; authorized.

   “The Official Strategy Guide”

4. Approved by authority; authorized.

   “Despite these testimonies, "accidental asphyxiation" remains his official cause of death.”

5. Sanctioned by the pharmacopoeia; appointed to be used in medicine; officinal.

   “an official drug or preparation”

6. Discharging an office or function.

   “the stomach and other parts official unto nutrition”

7. Relating to an office, especially a subordinate executive officer or attendant.
8. Relating to an ecclesiastical judge appointed by a bishop, chapter, archdeacon, etc., with charge of the spiritual jurisdiction.
9. (informal)True, real, beyond doubt.

   “Well, it's official: you lost your mind!”

10. Listed in a national pharmacopeia.

noun

1. An office holder, a person holding an official position in government, sports, or other organization.

   “Officials in the Firefly administration assure the Sylvanians they don't want war either.”

   “In most soccer games, there are three officials: the referee and two linesmen.”

   “The company's officials became nabobs as it took on more and more power after Plassey.”

   “...officials with their prehensile bottoms...”

   “If the takeover is approved, Comcast would control 20 of the top 25 cable markets […] Antitrust officials will need to consider Comcast’s status as a monopsony (a buyer with disproportionate power), when it comes to negotiations with programmers, whose channels it pays to carry.”