Source : Webster's Revised Unabridged Dictionary (1913)

Installation \In`stal*la"tion\, n. [F. installation, LL.
   installatio: cf. It. installazione. See {Install}.]
   1. The act of installing or giving possession of an office,
      rank, or order, with the usual rites or ceremonies; as,
      the installation of an ordained minister in a parish.

            On the election, the bishop gives a mandate for his
            installation.                         --Ayliffe.

   2. (Mech.) The whole of a system of machines, apparatus, and
      accessories, when set up and arranged for practical
      working, as in electric lighting, transmission of power,
      etc.

Source : WordNet®

installation
     n 1: the act of installing something (as equipment); "the
          telephone installation took only a few minutes" [syn: {installing},
           {installment}, {instalment}]
     2: a building or place that provides a particular service or is
        used for a particular industry; "the assembly plant is an
        enormous facility" [syn: {facility}]
     3: a formal entry into an organization or position or office;
        "his initiation into the club"; "he was ordered to report
        for induction into the army"; "he gave a speech as part of
        his installation into the hall of fame" [syn: {initiation},
         {induction}]