D defs.my
Entry 2 senses Webster, 1913

Invalidity

· In·va·lid·i·ty · IPA
01 n. Lack of validity or cogency; lack of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will.
  1. 1.
    Lack of validity or cogency; lack of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will.
  2. 2.
    Lack of health; infirmity.[Obs.]