definition of
[invalid]

[1] #1 invalid n. [shut-in] someone who is incapacitated by a chronic illness or injury. wn

[2] #2 invalid v. force to retire, remove from active duty, as of firemen. wn

[3] #3 invalid a. having no cogency or legal force; "invalid reasoning"; "an invalid driver's license". wn

[4] #4 invalid v. [disable, incapacitate, handicap] injure permanently; "He was disabled in a car accident". wn

[5] #5 invalid s. no longer valid; "the license is invalid". wn