Oxford Dictionary English

    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. Oxford Collocations Dictionary adverbscientifically, statistically, technically, … verbsbe, become, make something, … See full entry
  2. 2not based on all the facts, and therefore not correct an invalid argument Oxford Collocations Dictionary adverbscientifically, statistically, technically, … verbsbe, become, make something, … See full entry
  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’).
See invalid in the Oxford Learner's Dictionary of Academic EnglishSee invalid in the Oxford Advanced American Dictionary
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