Definition of "validity" []

• The state of being valid, authentic or genuine. (noun)
• Having legal force. (noun)
• A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability). (noun)

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• "I am familiar with Garcia v San Antonio (which, save for Bush v Gore, may be the least reasoned opinion of the Court I have ever read) but its validity is dubious and its relevance seems weak to the instant bill."
• "Court of Appeals for the Federal Circuit, which reviews patent validity, is extraordinarily pro-patent, the number of issued patents has grown steadily in recent decades."
• "An extreme example of this would be Saudi Arabia where the government eschews the expression “law” for man-made instruments of government and where their validity is determined by the religious authorities (“the Uléma”) although most Muslims would regard the school of Islam adopted by the Saudi Uléma as heterodox."