Definitions
1.NounThe state of being valid, authentic or genuine.
2.NounState of having legal force.
3.NounA 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).
4.NounThe genuinity, as distinguished from the efficacity or the regularity, of a sacrament as a result of some formal dispositions being fulfilled.