in·val·id·i·ty 
/ˌɪnvəˈlɪdəti/ noun
/ˌɪnvəˈlɪdəti/ noun [noncount] formal 1 : the state of having no force or effect : the state of being invalid
▪ the invalidity of the contract/election 2 Brit : the state or condition of being unable to work because of illness or injury : the state or condition of being an invalid
▪ an injured worker forced to live on invalidity benefit
▪ the invalidity of the contract/election
▪ an injured worker forced to live on invalidity benefit
