pre·med·i·ta·tion /(ˌ)priˌmɛdəˈteʃən/
  預先設想
  Pre·med·i·ta·tion n.  The act of meditating or contriving beforehand; previous deliberation; forethought.
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  premeditation
       n 1: planning or plotting in advance of acting [syn: forethought]
       2: (law) thought and intention to commit a crime well in
          advance of the crime; goes to show criminal intent