in·stru·men·tal·i·ty 
(ĭn′strə-mĕn-tălĭ-tē)
(ĭn′strə-mĕn-tălĭ-tē)n. pl. in·stru·men·tal·i·ties
1. The state or quality of being instrumental.
2. A means; an agency.
3. A subsidiary branch, as of a government, by means of which functions or policies are carried out.