official

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to an office or a post of authority.
• adjective Authorized by a proper authority; authoritative.
• adjective Holding office or serving in a public capacity.
• adjective Characteristic of or befitting a person of authority; formal.
• adjective Authorized by or contained in the US Pharmacopoeia or National Formulary. Used of drugs.
• noun One who holds an office or position, especially one who acts in a subordinate capacity for an institution such as a corporation or governmental agency.
• noun Sports A referee or umpire.

from The Century Dictionary.

• In pharm., authorized by the pharmacopœia of some country or countries: as, an official drug; an official preparation. In this sense recent, displacing the broader term officinal.
• Of or pertaining to office or the performance of the duties of an office: as, official duty; official cares or responsibility.
• Derived from the proper office or officer, or from the proper authority; made or communicated by virtue of authority; hence, authorized: as, an official statement or report.
• Performing duties or offices; rendering useful service; ministering.
• noun One who is invested with an office of a public nature; one holding a civil appointment: as, a government official; a railway official.
• noun In English ecclesiastical law, a person appointed as judge by a bishop, chapter, or archdeacon, to hear causes in the ecclesiastical courts.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who holds an office; esp., a subordinate executive officer or attendant.
• noun An ecclesiastical judge appointed by a bishop, chapter, archdeacon, etc., with charge of the spiritual jurisdiction.
• adjective Of or pertaining to an office or public trust.
• adjective Derived from the proper office or officer, or from the proper authority; made or communicated by virtue of authority.
• adjective (Pharm.) Approved by authority; sanctioned by the pharmacopœia; appointed to be used in medicine. Cf. Officinal.
• adjective obsolete Discharging an office or function.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of or pertaining to an office or public trust.
• adjective Derived from the proper office or officer, or from the proper authority; made or communicated by virtue of authority
• adjective Approved by authority; authorized.
• adjective sanctioned by the pharmacopoeia; appointed to be used in medicine; officinal
• adjective Discharging an office or function.
• adjective Relating to an office; especially, to a subordinate executive officer or attendant.
• adjective Relating to an ecclesiastical judge appointed by a bishop, chapter, archdeacon, etc., with charge of the spiritual jurisdiction.
• noun An office holder invested with powers and authorities.
• noun A person responsible for applying the rules of a game or sport in a competition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective (of a church) given official status as a national or state institution
• noun a worker who holds or is invested with an office
• adjective conforming to set usage, procedure, or discipline
• adjective of or relating to an office
• adjective having official authority or sanction
• adjective verified officially
• noun someone who administers the rules of a game or sport