/ləˈdʒɪt̬.ə.mət/
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fair or reasonable 公正的，正当的，合理的:
If you say that something such as a feeling or claim is legitimate, you think that it is reasonable and justified. -
real, accepted, or official
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for which there is a fair and acceptable reason 正当合理的；合情合理的
noun
legitimacy
Many question the legitimacy of the law.