Invalid definition and meaning | Collins English Dictionary

invalid in American English 1 · 1. not well; weak and sickly; infirm · 2. of or for invalids. an invalid home. noun · 3. a weak, sickly person; esp., one who is ... EnglishDictionary Thesaurus WordLists Grammar EnglishEasyLearningGrammar GrammarPatterns EnglishUsage TeachingResources VideoGuides Conjugations Quiz Englishgrammar Englishcollocations Englishconfusables Englishidioms Englishusage Thematicwordlists English French German Italian Spanish Portuguese Hindi Chinese Definitionof 'invalid'    WordFrequency Share× Credits× invalid Wordforms:pluralinvalids pronunciationnote: Thenounispronounced(ɪnvəlɪd ).Theadjectiveispronounced(ɪnvælɪd )andishyphenatedin|val|id.1. countablenoun Aninvalidissomeonewhoneedstobecaredforbecausetheyhaveanillnessordisability. Ihatebeingtreatedasaninvalid. Synonyms:patient,sufferer,convalescent,valetudinarian MoreSynonymsofinvalid 2. adjective Ifanaction,procedure,ordocumentisinvalid,itcannotbeaccepted,becauseitbreaksthelaworsomeofficialrule. Thetrialwasstoppedandtheresultsdeclaredinvalid. Wecannotacceptliabilityifyouarerefusedentrybecauseofinvaliddocuments. Synonyms:nullandvoid,void,worthless,untrue MoreSynonymsofinvalid invalidity(ɪnvəlɪdɪti )uncountablenoun...theinvalidityofthemarriageceremony. Synonyms:falsity,fallacy,unsoundness,inconsistency MoreSynonymsofinvalid 3. adjective Aninvalidargumentorconclusioniswrongbecauseitisbasedonamistake. Wethinkthatthoseargumentsarerenderedinvalidbythehardfactsontheground. Synonyms:unfounded,false,untrue,illogical MoreSynonymsofinvalid COBUILDAdvancedEnglishDictionary.Copyright©HarperCollinsPublishers Video:pronunciationof invalid Youmayalsolike EnglishQuizConfusables Synonymsof'invalid' LanguageLover'sBlog FrenchTranslationof'invalid' Translateyourtext PronunciationPlaylists Wordoftheday:'hygge' HindiTranslationof'invalid' NEWfromCollins! EnglishGrammar CollinsApps WordFrequency invalidinBritishEnglish1 (ˈɪnvəlɪd ) noun1. a. apersonwithdisablementorchronicillhealth b. (asmodifier) aninvalidchair adjective2. incapacitatedordisabledbyinjury,sickness,etc verb(transitive)3. tocausetobecomeaninvalid;disable 4. (usuallyfollbyout;oftenpassive)mainlyBritish torequire(amemberofthearmedforces)toretirefromactiveservicethroughwoundsorillness ▶ USAGEItisbesttoavoidusingtheterminvalidwhenreferringtopeoplewithchronicillnessesordisabilitiesCollinsEnglishDictionary.Copyright©HarperCollinsPublishers Derivedformsinvalidity(ˌinvaˈlidity)noun WordoriginC17:fromLatininvalidusinfirm,fromin-1+validusstrong WordFrequency invalidinBritishEnglish2 (ɪnˈvælɪd ) adjective1. notvalid;havingnocogencyorlegalforce 2. logic (ofanargument)havingaconclusionthatdoesnotfollowfromthepremises:itmaybefalsewhenthepremisesarealltrue;notvalid CollinsEnglishDictionary.Copyright©HarperCollinsPublishers Derivedformsinvalidity(ˌɪnvəˈlɪdɪtɪ )orinvalidness(inˈvalidness)noun invalidly(inˈvalidly)adverb WordoriginC16:fromMedievalLatininvaliduswithoutlegalforce;seeinvalid1 WordFrequency invalidinAmericanEnglish1 (ˈɪnvəlɪd ;ChieflyBritishˈɪnvəˈlid ) adjective1.  notwell;weakandsickly;infirm 2.  oforforinvalids aninvalidhome noun3.  aweak,sicklyperson;esp.,onewhoischronicallyillordisabled verbtransitive4.  tomakeinvalid;disableorweaken 5. ChieflyBritish toremove(asoldier,sailor,etc.)fromactivedutyorfromacombatzonebecauseofinjuryorillness Webster’sNewWorldCollegeDictionary,4thEdition.Copyright©2010by HoughtonMifflinHarcourt.Allrightsreserved. WordoriginFrinvalide