Definition from macmillandictionary.com
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You will need a valid passport.
This offer is valid for travel before the end of April.
A 50% turnout was required for the vote to be valid.
a valid claim
a valid password/filename
If the underlying assumption isn’t valid, then the prosecution’s case simply falls apart.
These are valid reasons why we should ban tobacco advertising.
Some of the criticisms were perfectly valid.
the validity of the claim