Ĭn'va-lĭd'ĭ-ty, n.

n. [Prefix in, not, and validity; L. Lat. invaliditas, Fr. invalidité, It. invalidità, Sp. invalididad.]

1. Want of cogency; want of legal force or efficacy; as, the invalidity of an agreement or of a will.
2. Want of health; infirmity. [Obs.]