Validity
Part of speech: noun
Definition: The state of being valid, authentic or genuine. 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).
Example sentence: No force can conquer the service personnel and people who, in support of their great leader, have turned out in the struggle to defend their country with confidence in the validity of their cause and their own strength - this is a law and a truth taught by history.
Validness
Part of speech: noun
Definition: the state of being valid