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Dictionary definition for: Invalid
1. (n) someone who is incapacitated by a chronic illness or injury
2. (v) force to retire, remove from active duty, as of firemen
3. (a) having no cogency or legal force; "invalid reasoning" "an invalid driver''s license"
4. (v) injure permanently; "He was disabled in a car accident"
5. (s) no longer valid; "the license is invalid"
WordNet 2.1 Copyright Princeton University. All rights reserved.