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1. Dictionary

   invalid

   /ɪnˈvalɪd/

   adjective

   • 1. (of an official document or procedure) not legally recognized because it contravenes a regulation or law: "the will was declared invalid and the children were entitled to the estate" Similar voidlegally voidnullnull and voidunenforceablenot bindinginoperativeworthlessillegitimateincorrectimproperunacceptableinapplicableannullednullifiedcancelledrevokedrescindedabolishedrepealedOpposite validbinding
   • ▪ (especially of an argument, statement, or theory) not true because based on erroneous information or unsound reasoning: "a comparison is invalid if we are not comparing like with like" Similar falseuntrueinaccuratefaultyfallaciousspuriousinadequateunconvincingunsoundweakwrongwrongly inferredwide of the markoff targetunjustifiedunsubstantiatedunwarranteduntenablebaselessill-foundedunfoundedgroundlessillogicalirrationalunscientificabsurdpreposterousinconsistentinformal:off beamoutway outfull of holesbogusOpposite trueaccurate
   • ▪ (of computer instructions, data, etc.) not conforming to the correct format or specifications.

   Word Origin mid 16th century (earlier than valid): from Latin invalidus, from in- ‘not’ + validus ‘strong’ (see valid).

   Derivatives

   • 1. invalidly adverb

   Scrabble Points: 11

   • I

     1

   • N

     1

   • V

     4

   • A

     1

   • L

     1

   • I

     1

   • D

     2

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   More definitions, origin and scrabble points

2. dictionary.cambridge.org › dictionary › englishINVALID | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

3. www.merriam-webster.com › dictionary › invalidInvalid Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › invalid

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   : being without foundation or force in fact, truth, or law. an invalid assumption. declared the will invalid. b. : logically inconsequent. invalidly. (ˌ)in-ˈva-ləd-lē. adverb. invalid. 2 of 4. noun. in· va· lid ˈin-və-ləd. British usually -ˌlēd. : one who is sickly or disabled. invalid. 3 of 4. verb. in· va· lid ˈin-və-ləd. -ˌlid,

4. www.collinsdictionary.com › dictionary › englishINVALID definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   An invalid is someone who needs to be cared for because they have an illness or disability. I hate being treated as an invalid.

5. www.dictionary.com › browse › invalidINVALID Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › invalid

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   not valid; not founded in truth, fact, or logic, and hence weak and indefensible; unsound; untenable: The entire argument depends on an invalid assumption. Synonyms: incorrect, inaccurate, false, erroneous, unsubstantiated, unfounded, groundless, baseless. deficient in effectiveness; inadequate:

6. dictionary.cambridge.org › dictionary › learner-englishINVALID | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › dictionary › learner-english

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   INVALID definition: 1. someone who is so sick that they have to be looked after by other people 2. An invalid document…. Learn more.

7. www.oxfordlearnersdictionaries.com › definition › englishinvalid adjective - Definition, pictures, pronunciation and usage...

   www.oxfordlearnersdictionaries.com › definition › english

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   Definition of invalid adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

8. www.vocabulary.com › dictionary › invalidInvalid - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › invalid

   A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid.

9. www.yourdictionary.com › invalidInvalid Definition & Meaning | YourDictionary

   www.yourdictionary.com › invalid

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   noun. invalids. A weak, sickly person; esp., one who is chronically ill or disabled. Webster's New World. Similar definitions. Synonyms: weak. void. useless. unreasonable. unfounded. sickly. null. infirm. ineffective. feeble. cripple. valetudinarian. worthless. shut in. bed case. adjective. Incapacitated by illness or injury.

10. www.thefreedictionary.com › invalidInvalid - definition of invalid by The Free Dictionary

    www.thefreedictionary.com › invalid

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    adj. suffering from or disabled by injury, sickness, etc. vb ( tr) 1. to cause to become an invalid; disable. 2. ( usually foll by out; often passive) chiefly Brit to require (a member of the armed forces) to retire from active service through wounds or illness.

11. dictionary.cambridge.org › us › dictionaryINVALID | definition in the Cambridge English Dictionary

    dictionary.cambridge.org › us › dictionary

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    INVALID meaning: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.