Definitions of realization:

• noun:   something that is made real or concrete

  Example: "The victory was the realization of a whole year's work"

• noun:   making real or giving the appearance of reality
• noun:   the completion or enrichment of a piece of music left sparsely notated by a composer
• noun:   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
• noun:   coming to understand something clearly and distinctly

  Example: "A growing realization of the risk involved"

• noun:   a musical composition that has been completed or enriched by someone other than the composer