effectiveness
noun OPAL W
/ɪˈfektɪvnəs/
/ɪˈfektɪvnəs/
(also less frequent effectivity
[uncountable] /ɪˌfekˈtɪvəti/
/ɪˌfekˈtɪvəti/
)- the fact of producing the result that is wanted or intended; the fact of producing a successful result
- to check the effectiveness of the security system