effectiveness
US /əˈfek.tɪv.nəs/
UK /əˈfek.tɪv.nəs/

1.
efektivitas, keberhasilan
the degree to which something is successful in producing a desired result; success
:
•
The effectiveness of the new policy is still being evaluated.
Efektivitas kebijakan baru masih dievaluasi.
•
We need to improve the effectiveness of our marketing campaigns.
Kita perlu meningkatkan efektivitas kampanye pemasaran kita.