VALIDITY
cogency, validity, rigor, rigour
(noun) the quality of being valid and rigorous
validity, validness
(noun) the quality of having legal force or effectiveness
Source: WordNet® 3.1
Etymology
Noun
validity (countable and uncountable, plural validities)
The state of being valid, authentic or genuine.
State of having legal force.
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).
Source: Wiktionary
Va*lid"i*ty, n. Etym: [Cf. F. validité, L. validitas strength.]
1. The quality or state of being valid; strength; force; especially,
power to convince; justness; soundness; as, the validity of an
argument or proof; the validity of an objection.
2. (Law)
Definition: Legal strength, force, or authority; that quality of a thing
which renders it supportable in law, or equity; as, the validity of a
will; the validity of a contract, claim, or title.
3. Value. [Obs.] "Rich validity." Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition