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1.
having no cogency or legal force
invalid reasoning
an invalid driver's license
2.
no longer valid
the license is invalid
'invalid' - used as a noun
3.
someone who is incapacitated by a chronic illness or injury
'invalid' - used as a verb
4.
force to retire, remove from active duty, as of firemen
5.
injure permanently
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derived forms
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1. Invalid / Plural
invalids
2. Invalid / Past
invalided
3. Invalid / Third Person
invalids
4. Invalid / Present Participle
invaliding
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