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Validity (noun)
The state of being valid, authentic or genuine.
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Validity (noun)
Having legal force.
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Validity (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).
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Reliability (noun)
The quality of being reliable, dependable{{,}} or trustworthy.
“dependable”
“unreliable”
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Reliability (noun)
the ability to measure the same thing consistently (of a measurement indicating the degree to which the measure is consistent); that is, repeated measurements would give the same result (See also validity).
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Reliability (noun)
– measurable time of work before failure
Wiktionary