1 : affected by disease or disability : sickly. 2 : of, relating to, or suited to one that is sick an invalid chair.

Who is considered an invalid?

Invalid may refer to: Patient, a sick person. one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term) .

What does invalid mean in legal terms?

Null; void; without force or effect; lacking in authority. For example, a will that has not been properly witnessed is invalid and unenforceable.