Definition of invalid adjective from the Oxford Advanced American Dictionary

     

    invalid1

     adjective
    adjective
    NAmE//ɪnˈvæləd//
     
     
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  1. 1not legally or officially acceptable The treaty was declared invalid because it had not been ratified. People with invalid papers are deported to another country.
  2. 2not based on all the facts, and therefore not correct an invalid argument
  3. 3(computing) of a type that the computer cannot recognize An error code will be displayed if any invalid information has been entered. invalid characters opposite valid

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