The Collaborative International Dictionary of English v.0.48:

Build \Build\ (b[i^]ld), v. t. [imp. & p. p. Built (b[i^]lt);
   p. pr. & vb. n. Building. The regular imp. & p. p.
   Builded is antiquated.] [OE. bulden, bilden, AS. byldan to
   build, fr. bold house; cf. Icel. b[=o]l farm, abode, Dan. bol
   small farm, OSw. bol, b["o]le, house, dwelling, fr. root of
   Icel. b[=u]a to dwell; akin to E. be, bower, boor. [root]97.]
   1. To erect or construct, as an edifice or fabric of any
      kind; to form by uniting materials into a regular
      structure; to fabricate; to make; to raise.
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            Nor aught availed him now
            To have built in heaven high towers.  --Milton.
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   2. To raise or place on a foundation; to form, establish, or
      produce by using appropriate means.
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            Who builds his hopes in air of your good looks.
                                                  --Shak.
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   3. To increase and strengthen; to increase the power and
      stability of; to settle, or establish, and preserve; --
      frequently with up; as, to build up one's constitution.
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            I commend you to God, and to the word of his grace,
            which is able to build you up.        --Acts xx. 32.
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   Syn: To erect; construct; raise; found; frame.
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The Collaborative International Dictionary of English v.0.48:

Building \Build"ing\, n.
   1. The act of constructing, erecting, or establishing.
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            Hence it is that the building of our Sion rises no
            faster.                               --Bp. Hall.
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   2. The art of constructing edifices, or the practice of civil
      architecture.
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            The execution of works of architecture necessarily
            includes building; but building is frequently
            employed when the result is not architectural.
                                                  --Hosking.
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   3. That which is built; a fabric or edifice constructed, as a
      house, a church, etc.
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            Thy sumptuous buildings and thy wife's attire
            Have cost a mass of public treasury.  --Shak.
      [1913 Webster] buildup

WordNet (r) 3.0 (2006):

building
    n 1: a structure that has a roof and walls and stands more or
         less permanently in one place; "there was a three-story
         building on the corner"; "it was an imposing edifice" [syn:
         building, edifice]
    2: the act of constructing something; "during the construction
       we had to take a detour"; "his hobby was the building of
       boats" [syn: construction, building]
    3: the commercial activity involved in repairing old structures
       or constructing new ones; "their main business is home
       construction"; "workers in the building trades" [syn:
       construction, building]
    4: the occupants of a building; "the entire building complained
       about the noise"