Englishfor English speakers
validity
Noun
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The validity of a licence, ticket, document, etc. depends on whether it is official and acceptable.
The validity of a passport depends on who carries it.
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The validity of evidence, a statement, a reason, etc. is the level to which it is true or reasonable.
Due to the doubts about the validity of the evidence presented, the case cannot go forward.
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In testing, the validity of a test is the level to which it is tests what it is supposed to test.
The validity of many IQ tests has been questioned.
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A validity is a quality of measurement that shows the degree by which the measurement reflects the thing beneath it.
coefficient
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noun
a constant number that serves as a measure of some property or characteristic