The quality or degree of being strong.
The intensity of a force or power; potency.
The strongest part of something; that on which confidence or reliance is based.
A positive attribute.
The state of being valid, authentic or genuine.
The genuinity - as distinguished from the efficacity or the regularity - of a sacrament as a result of some formal dispositions being fulfilled.
State of 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).