adjective Etymology: Latin efficac-, efficax, from efficere Date: 1528 having the power to produce a desired effect , see: effective ~ly adverb ~ness noun
EFFICACIOUS
Meaning of EFFICACIOUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012