4 ms·same with efficiency and effectiveness, a lot of ppl just don't know the differenceby geraldhh 3y agosame with efficiency and effectiveness, a lot of ppl just don't know the differenceazangru 3y agoplus efficacy :-)berkes 3y agoTIL (I'm not native EN) > efficacy /ĕf′ĭ-kə-sē/ > Power or capacity to produce a desired effect; effectiveness.