'official' definitions:

Definition of 'official'

From: WordNet
adjective
Having official authority or sanction; "official permission"; "an official representative" [ant: unofficial]
adjective
Of or relating to an office; "official privileges"
adjective
Verified officially; "the election returns are now official"
adjective
Conforming to set usage, procedure, or discipline; "in prescribed order" [syn: official, prescribed]
adjective
(of a church) given official status as a national or state institution
noun
A worker who holds or is invested with an office [syn: official, functionary]
noun
Someone who administers the rules of a game or sport; "the golfer asked for an official who could give him a ruling"

Definition of 'official'

From: GCIDE
  • established \established\ adj.
  • 1. brought about or set up or accepted; especially long and widely accepted; as, distrust of established authority; a team established as a member of a major league; enjoyed his prestige as an established writer; an established precedent; the established Church. Contrasted with unestablished. [Narrower terms: entrenched; implanted, planted, rooted; official; recognized] [WordNet 1.5]
  • 2. securely established; as, an established reputation.
  • Syn: firm. [WordNet 1.5]
  • 3. settled securely and unconditionally.
  • Syn: accomplished, effected. [WordNet 1.5]
  • 4. conforming with accepted standards. [WordNet 1.5]
  • 5. shown to be valid beyond a reasonable doubt; as, the established facts in the case.
  • Syn: proved. [WordNet 1.5 +PJC]
  • 6. (Bot.) introduced from another region and persisting without cultivation; -- of plants.
  • Syn: naturalized. [WordNet 1.5 +PJC]

Synonyms of 'official'

From: Moby Thesaurus