power to be effective; the quality of being able to bring about an effect同义词：effectivity, effectualness, effectuality
capacity to produce strong physiological or chemical effects同义词：potency, strength
例句
In data security, an attack on the security of a computer system, undertaken to test the effectiveness of the security and to highlight any areas of weakness.在数据保密学中，对一个计算机系统的安全性的攻击，用以测试安全的有效性及暴露弱点。
Legal effectiveness or validity.效力法律上的效力或者有效
Lacking vigor, force, or effectiveness; inadequate.缺乏活力、力量或效力的; 不充足的
Equal in force, power, effectiveness, or significance.相等的力量、能力、效力、或重要性等相等