Validity refers to the extent to which a test measures what it was intended to measure.
Other definition:
Validity refers to the extent to which a measure actually assesses the dimension or construct that the researcher sets out to measure.

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Content validity at psychology-glossary.com■■■■■■
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Construct validity at psychology-glossary.com■■■■■■
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External validity at psychology-glossary.com■■■■■
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Concurrent validity at psychology-glossary.com■■■■■
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Discriminant validity at psychology-glossary.com■■■■
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