agency
n.
1650s, "active operation," from Medieval Latin agentia, noun of state from Latin agentem (nominative agens) "effective, powerful," present participle of agere (see act, n.). Meaning "establishment where business is done for another" first recorded 1861.
〔李〕[ag=to do做；-ency n.=the quality or state of 表性质或状态→“the abiliy or place of doing business 办事的能力或场所”→] n.①power or force which causes a result 力量；作用