WordNet (r) 3.0 (2006):

realisation
    n 1: a musical composition that has been completed or enriched
         by someone other than the composer [syn: realization,
         realisation]
    2: coming to understand something clearly and distinctly; "a
       growing realization of the risk involved"; "a sudden
       recognition of the problem he faced"; "increasing recognition
       that diabetes frequently coexists with other chronic
       diseases" [syn: realization, realisation, recognition]
    3: a sale in order to obtain money (as a sale of stock or a sale
       of the estate of a bankrupt person) or the money so obtained
       [syn: realization, realisation]
    4: the completion or enrichment of a piece of music left
       sparsely notated by a composer [syn: realization,
       realisation]
    5: making real or giving the appearance of reality [syn:
       realization, realisation, actualization,
       actualisation]
    6: something that is made real or concrete; "the victory was the
       realization of a whole year's work" [syn: realization,
       realisation, fruition]