1.nounThe act of using or adapting as an instrument; a series or combination of instruments
2.nounThe 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.nounThe act or manner of playing upon musical instruments; performance
"He had a wonderful instrumentation."
4.nounOn a vehicle, dashboard gauges monitoring engine functions and performance, along with other essential functions.
"The car’s instrumentation included fuel, temperature, voltimeter and oil pressure gauges, along with a speedometer and tachometer."