1520s, from Latin efficacia "efficacy, efficiency," from efficax (genitive efficacis) "powerful, effectual, efficient," from stem of efficere "work out, accomplish" (see effect (n.)). Earlier in same sense was efficace (c. 1200), from Old French eficace (14c.), from Latin efficacia; also efficacite (early 15c.), from Latin efficacitatem.
例文
1. Recent medical studies confirm the efficacy of a healthier lifestyle.
最新の医学研究により、健康的なライフスタイルの利点が実証された。
2.This plan would have some efficacy in preventing any danger.
この計画は危険防止に有効である。
3.The treatment has no efficacy in that disease.
この治療法はその病気には関係ない。
4. Self - efficacy ( SE ) is being applied into computer use, which was defined as computer self - efficacy ( CSE ).