Definitions
1.AdjectiveNot valid; not true, correct, acceptable, or appropriate."Your argument is invalid because it uses circular reasoning.; This invalid contract cannot be legally enforced."
2.NounAny person with a disability or illness.
3.NounA person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
4.NounA disabled member of the armed forces; one unfit for active duty due to injury.
5.AdjectiveSuffering from disability or illness.
6.AdjectiveIntended for use by an invalid.
7.VerbTo exempt from (often military) duty because of injury or ill health."He was invalided home after the car crash."
8.VerbTo make invalid or affect with disease.