Valid(a.) Strong; powerful; efficient.
Valid(a.) Having sufficient strength or force; founded in truth; capable of being justified, defended, or supported; not weak or defective; sound; good; efficacious; as, a valid argument; a valid objection.
Valid(a.) Having legal strength or force; executed with the proper formalities; incapable of being rightfully overthrown or set aside; as, a valid deed; a valid covenant; a valid instrument of any kind; a valid claim or title; a valid marriage.
Validate(v. t.) To confirm; to render valid; to give legal force to.
Validation(n.) The act of giving validity.
Validity(n.) 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.
Validity(n.) 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.
Validity(n.) Value.
Validly(adv.) In a valid manner; so as to be valid.
Validness(n.) The quality or state of being valid.

Words within validation