12 invə|lidəd.ē, |inva|-, -idətē, -i noun
Etymology: Middle French or Medieval Latin; Middle French invalidité, from Medieval Latin invaliditat-, invaliditas, from invalidus void, without legal force + Latin -itat-, -itas -ity
1. : lack of sound foundation or binding legal force
2.
[ invalid (III) + -ity ]
a. : incapacity to work because of prolonged illness or disability
insurance for sickness and invalidity and for the provision of medical service for the working class — R.V.Sires
b. : invalidism