The Collaborative International Dictionary of English v.0.48:

Official \Of*fi"cial\, a. [L. officialis: cf. F. officiel. See
   Office, and cf. Official, n.]
   1. Of or pertaining to an office or public trust; as,
      official duties, or routine.
      [1913 Webster]

            That, in the official marks invested, you
            Anon do meet the senate.              --Shak.
      [1913 Webster]

   2. Derived from the proper office or officer, or from the
      proper authority; made or communicated by virtue of
      authority; as, an official statement or report.
      [1913 Webster]

   3. (Pharm.) Approved by authority; sanctioned by the
      pharmacopoeia; appointed to be used in medicine; as, an
      official drug or preparation. Cf. Officinal.
      [1913 Webster]

   4. Discharging an office or function. [Obs.]
      [1913 Webster]

            The stomach and other parts official unto nutrition.
                                                  --Sir T.
                                                  Browne.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Official \Of*fi"cial\, n. [L. officialis a magistrate's servant
   or attendant: cf. F. official. See Official, a., and cf.
   Officer.]
   1. One who holds an office; esp., a subordinate executive
      officer or attendant.
      [1913 Webster]

   2. An ecclesiastical judge appointed by a bishop, chapter,
      archdeacon, etc., with charge of the spiritual
      jurisdiction. --Blackstone.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

official
    adj 1: having official authority or sanction; "official
           permission"; "an official representative" [ant:
           unofficial]
    2: of or relating to an office; "official privileges"
    3: verified officially; "the election returns are now official"
    4: conforming to set usage, procedure, or discipline; "in
       prescribed order" [syn: official, prescribed]
    5: (of a church) given official status as a national or state
       institution
    n 1: a worker who holds or is invested with an office [syn:
         official, functionary]
    2: someone who administers the rules of a game or sport; "the
       golfer asked for an official who could give him a ruling"