in ‧ va ‧ lid ‧ it ‧ y AC /ˌɪnvəˈlɪdəti, ˌɪnvəˈlɪdɪti/ BrE AmE noun [uncountable] formal
[ Word Family: verb : ↑ validate ≠ ↑ invalidate ; noun : ↑ validity ≠ ↑ invalidity ; adjective : ↑ valid ≠ ↑ invalid ]
1 . the state of being too ill, old, or injured to work:
invalidity benefit
2 . the state of being not legally or officially acceptable