or·ches·tra·tion /ˌɔrkəˈstreʃən/
  管弦樂編曲,管弦樂作曲法
  Or·ches·tra·tion n. Mus. The arrangement of music for an orchestra; orchestral treatment of a composition; -- called also instrumentation.
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  orchestration
       n 1: an arrangement of a piece of music for performance by an
            orchestra or band
       2: the act of arranging a piece of music for an orchestra and
          assigning parts to the different musical instruments [syn:
           instrumentation]
       3: an arrangement of events that attempts to achieve a maximum
          effect; "the skillful orchestration of his political
          campaign"