Source : Webster's Revised Unabridged Dictionary (1913)

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.

            That, in the official marks invested, you Anon do
            meet the senate.                      --Shak.

   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.

   3. (Pharm.) Approved by authority; sanctioned by the
      pharmacop[oe]ia; appointed to be used in medicine; as, an
      official drug or preparation. Cf. {Officinal}.

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

            The stomach and other parts official unto nutrition.
                                                  --Sir T.
                                                  Browne.

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.

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

Source : WordNet®

official
     n 1: a worker who holds or is invested with an office [syn: {functionary}]
     2: someone who administers the rules of a game or sport; "the
        golfer asked for an official who could give him a ruling"

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: {prescribed}]
     5: (of a church) given official status as a national or state
        institution