1. the quality of being valid and rigorous

2. the quality of having legal force or effectiveness

3. the property of being strong and healthy in constitution

1.正当(性);正确(性)；可信(性)
The validity of something such as a result or a piece of information is whether it can be trusted or believed.

e.g. Shocked by the results of the elections, they now want to challenge thevalidity of the vote...
选举结果令他们很震惊，他们现在要对选举的可信性提出质疑。
e.g. Some people, of course, denied thevalidity of any such claim.
当然，一些人否定了此类说法的合理性。

1. validity

1. 效度：+ 效度(validity)是指当测验用於某一特定目的时,对於支持测验分数解释的那些证据和理论所做的整体评鉴. 也因此,效度是测验编制过程和测验评鉴中最重要的考虑项目. - 在教育和雇用情境里使用测验的一个重要问题是,

2. validity的反义词

2. 有效期：报价的时候,要说清楚把产品的规格(specification),支付方式(payment),包装(packing),装船时间(shipment),有效期(validity)一一列出来. 具体方式看各人而言了.

3. 有效：英语测试与评价是检测学生综合语言运用能力发展程度的重要途径. 好的语言测试一般应具备五个原则:即,有效(validity)、可靠(reliability)、区分(discrimination)、现实(reality)和教育,