- Invalid is defined as not correct or provable or not legally recognized.
- An example of invalid is a theory that has been proven wrong.
- An example of invalid is a marriage without a proper marriage license.
- The definition of an invalid is a sick, weak person.
An example of an invalid is a feeble old woman in a hospital who cannot walk.
An elderly invalid.
invalid definition by Webster's New World
- not well; weak and sickly; infirm
- of or for invalids: an invalid home
Origin: French invalide ; from Classical Latin invalidus, feeble: see in- and amp; valid
- to make invalid; disable or weaken
- Chiefly Brit. to remove (a soldier, sailor, etc.) from active duty or from a combat zone because of injury or illness
Origin: Classical Latin invalidus
invalid definition by American Heritage Dictionary
- Incapacitated by illness or injury.
- Of, relating to, or intended for invalids.
- To incapacitate physically.
- Chiefly British To release or exempt from duty because of ill health: “I was not quite sick enough to be invalided out, even though I was of no more use” (Mary Lee Settle).
Origin: From invalid2 (influenced by French invalide, sickly, infirm).
- Not legally or factually valid; null: an invalid license.
- Falsely based or reasoned; faulty: an invalid argument.
Origin: Latin invalidus, weak : in-, not; see in-1 + validus, strong (from valēre, to be strong; see wal- in Indo-European roots).
- inˌva·lidˈi·ty noun
- in·valˈid·ly adverb
invalid - Legal Definition
invalid - Medical Definition