producing the result that is wanted or intended; producing a successful result 有效的；产生预期结果的◆training managers to be more effective leaders 将经理培训成更得力的领导人◆The ad was simple but highly effective. 广告很简单，但非常有效。◆Promotions can be effective in attracting new customers. 促销可有效吸引新客户。
(about laws, contracts, etc.) officially starting to apply （法律、合同等）生效的，起作用的◆The law becomes effective on 1 March. 这项法律於 3 月 1 日生效。◆The price increase, effective from 15 July, has received a lot of criticism. 自 7 月 15 日起生效的提价方案已受很多批评。➡effective date
[] in reality, although not officially intended 实际的；事实上的◆The deal gives the bank effective control of the company. 这项协议赋予这银行对公司的实际控制权。
▸efˈfectiveness
noun
[] ◆assessing the effectiveness of the marketing campaign 评估营销活动的有效性cost-effective