English Online Dictionary. What means validity? What does validity mean?
valid + -ity, borrowed from Middle French validité, from Late Latin validitas.
validity (countable and uncountable, plural validities)
- The state of being valid, authentic or genuine.
- 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).