Definition of "validity"
noun:
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The state of being valid, authentic or genuine.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Having legal force.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
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).
from Wiktionary, Creative Commons Attribution/Share-Alike License
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