The Collaborative International Dictionary of English v.0.48:

Demolition \Dem`o*li"tion\ (?; 277), n. [L. demolitio, fr.
   demoliri: cf. F. d['e]molition. See Demolish.]
   The act of overthrowing, pulling down, or destroying a pile
   or structure; destruction by violence; utter overthrow; --
   opposed to construction; as, the demolition of a house, of
   military works, of a town, or of hopes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

demolition
    n 1: an event (or the result of an event) that completely
         destroys something [syn: destruction, demolition,
         wipeout]
    2: the act of demolishing