Noah Webster
Validity
VALID'ITY, noun
1. Strength or force to convince; justness; soundness; as the validity of an argument or proof; the validity of an objection.
2. Legal strength or force; that quality of a thing which renders it supportable in law or equity; as the validity of a will; the validity of a grant; the validity of a claim or of a title. Certain forms and solemnities are usually requisite to give validity to contracts and conveyances of rights.
3. Value. [Not in use.]