1. [ noun ] (medicine) someone who is incapacitated by a chronic illness or injury
Synonyms: shut-in
Related terms: sick_person homebound
2. [ adjective ] no longer valid

"the license is invalid"

Related terms: expired
3. [ verb ] (work) force to retire, remove from active duty, as of firemen
Related terms: remove
4. [ adjective ] having no cogency or legal force

"invalid reasoning" "an invalid driver's license"

Related terms: valid nugatory false invalidated bad sophistic specious fallacious illegitimate
5. [ verb ] injure permanently
Synonyms: handicap incapacitate disable

"He was disabled in a car accident"

Related terms: injure hock disability
Similar spelling:   invalidity