EFFICACIOUS


Meaning of EFFICACIOUS in English

[ ˌɛfɪ'keɪʃəs ]

■ adjective formal effective.

Derivatives

~ly adverb

~ness noun

efficacy 'ɛfɪkəsi noun

Origin

C16: from L. efficax , efficac- (from efficere 'accomplish') + -ious .

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.