#1 invalid n. [shut-in] someone who is incapacitated by a chronic illness or injury. wn
#2 invalid v. force to retire, remove from active duty, as of firemen. wn
#3 invalid a. having no cogency or legal force; "invalid reasoning"; "an invalid driver's license". wn
#4 invalid v. [disable, incapacitate, handicap] injure permanently; "He was disabled in a car accident". wn
#5 invalid s. no longer valid; "the license is invalid". wn
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