Definify.com

Webster 1913 Edition

Noun.

[Cf. F.

invalidité

, LL.

invaliditas

lack of health.]

Lack of validity or cogency; lack of legal force or efficacy; invalidness;

as, the

invalidity

of an agreement or of a will

Lack of health; infirmity.

[Obs.]

Sir W. Temple.

Noun.

Weakness; want of cogency; want of legal force or efficacy; as the invalidity of an agreement or of a will.

invalidity ‎(countable and uncountable, plural invalidities)