Definition of invalidity noun from the Oxford Advanced Learner's Dictionary

      

    invalidity

     noun
    noun
    BrE BrE//ˌɪnvəˈlɪdəti//
     
    ; NAmE NAmE//ˌɪnvəˈlɪdəti//
     
    [uncountable]
     
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  1. 1(British English, specialist) the state of being unable to take care of yourself because of illness or injury
  2. 2(formal) the state of not being legally or officially acceptable compare validity
See the Oxford Advanced American Dictionary entry: invalidity