Definition of invalid adjective from the Oxford Advanced Learner's Dictionary

     

    invalid

     adjective
    adjective
    BrE BrE//ɪnˈvælɪd//
     
    ; NAmE NAmE//ɪnˈvælɪd//
     
    Computer programming
     
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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. This action would render the agreement invalid.
  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 See related entries: Computer programming
  4. opposite valid
    Word Originadjective mid 16th cent. (earlier than valid): from Latin invalidus, from in- ‘not’ + validus ‘strong’ (from valere ‘be strong’).

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