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From The Collaborative International Dictionary of English v.0.48:
Validity \Va*lid"i*ty\, n. [Cf. F. validit['e], L. validitas strength.] [1913 Webster] 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. [1913 Webster] 2. (Law) 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. [1913 Webster] 3. Value. [Obs.] "Rich validity." --Shak. [1913 Webster]