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.
- surety
- surety bond
- suretyship
- surf
- surface
- surface-active
- surface dive
- surface diver
- surface diving
- surface-effect ship
- surface mail
- surface of revolution
- surface plate
- surface structure
- surface tension
- surface-to-air missile
- surface-to-surface missile
- surface wave
- surfactant
- surf and turf
- surfbird
- surfboard
- surfboarder
- surfboarding
- surfboat