Validity/vəˈlɪdəti/ Definition 1 of 4Pro Tip 1/2Evidential Support The word 'validity' implies there is evidence backing a claim or idea. Her research gains validity with the new data. Pro Tip 2/2Not Always True 'Validity' doesn't mean the argument is ultimately true, just that it's logically sound. Despite its validity, the theory was later disproven.