noun

1. The act of using or adapting as an instrument; a series or combination of instruments

2. The arrangement of a musical composition for performance by a number of different instruments; orchestration; instrumental composition; composition for an orchestra or military band.

   “They changed the woodwind instrumentation to piccollos and saxophones, and as a result it sounded much more clumsy.”

3. The act or manner of playing upon musical instruments; performance

   “He had a wonderful instrumentation.”