Definitions for validness
Random House Webster's College Dictionary
sound; just; well-founded.
producing the desired result; effective:
a valid remedy.
having force, weight, or cogency; authoritative.
legally sound, effective, or binding:
a valid contract.
(of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
Archaic. robust; healthy.
Origin of valid:
1565–75; < L validus strong =val(ēre) to be strong +-idus -id4
the quality of having legal force or effectiveness
the state of being valid
the quality or state of being valid