instrumentality

noun | \ ˌin-strə-mən-ˈta-lə-tē, -ˌmen- \ | in·stru·men·tal·i·ty

1. : something through which an end is achieved or occurs damages incurred in a single incident through an instrumentality owned by the employer

2. : something that serves as an intermediary or agent through which one or more functions of a larger controlling entity are carried out : a part or branch especially of a governing body — compare alter ego