Learner's definition of VALID
1
[more valid; most valid] : fair or reasonable正当的；合理的 -
a valid argument有根据的论点
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valid concerns合情合理的担忧
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There is no valid reason to proceed with the change.没有继续这种变革的正当理由。
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Her objections/conclusions were completely valid.她的反对/结论完全是合理的。
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You make a valid point.你提出的论点完全站得住脚。
2
: acceptable according to the law（法律上）有效的，认可的 -
a valid contract/license/deed/title有效的合同/许可证/契约/头衔
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You must present valid identification.你必须出示有效证件。
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Their marriage is not legally valid.他们的婚姻在法律上是无效的。
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The agreement is no longer valid under international law.按照国际法，这个协议不再有效。
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My passport is still valid. [=it has not expired yet]我的护照现在仍然有效。
— opposite invalid