Webster’s Revised Unabridged Dictionary · 1913
Invalidity
In′va·lid′i·ty (ĭn′vȧ·lĭd′ĭ·ty̆), n. [Cf. F. invalidité, LL. invaliditas want of health.]
1. Want of validity or cogency; want of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will.
2. Want of health; infirmity. [Obs.] Sir W. Temple.