D defs.my
Entry 1 sense Webster, 1913

Orchestration

/ôrˌ-kəs-trāsh'-ən/ · Or·ches·tra·tion · IPA /ˌɔrkəstrˈeɪʃən/
01 n. The arrangement of music for an orchestra; orchestral treatment of a composition; -- called also instrumentation.
  1. 1.
    The arrangement of music for an orchestra; orchestral treatment of a composition; -- called also instrumentation.(Mus.) Also: instrumentation