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

 

invalid

 verb
verbVerb Forms present simple I / you / we / they invalid
BrE BrE//ˈɪnvəlɪd//
 
; NAmE NAmE//ˈɪnvəlɪd//
 
; BrE BrE//ˈɪnvəliːd//
 
; NAmE NAmE//ˈɪnvəliːd//
 
he / she / it invalids
BrE BrE//ˈɪnvəlɪdz//
 
; NAmE NAmE//ˈɪnvəlɪdz//
 
; BrE BrE//ˈɪnvəliːdz//
 
; NAmE NAmE//ˈɪnvəliːdz//
 
past simple invalided
BrE BrE//ˈɪnvəlɪdɪd//
 
; NAmE NAmE//ˈɪnvəlɪdɪd//
 
; BrE BrE//ˈɪnvəliːdɪd//
 
; NAmE NAmE//ˈɪnvəliːdɪd//
 
past participle invalided
BrE BrE//ˈɪnvəlɪdɪd//
 
; NAmE NAmE//ˈɪnvəlɪdɪd//
 
; BrE BrE//ˈɪnvəliːdɪd//
 
; NAmE NAmE//ˈɪnvəliːdɪd//
 
-ing form invaliding
BrE BrE//ˈɪnvəlɪdɪŋ//
 
; NAmE NAmE//ˈɪnvəlɪdɪŋ//
 
; BrE BrE//ˈɪnvəliːdɪŋ//
 
; NAmE NAmE//ˈɪnvəliːdɪŋ//
 
 
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BrE BrE//ˈɪnvəlɪd//
 
; NAmE NAmE//ˈɪnvəlɪd//
 
; BrE BrE//ˈɪnvəliːd//
 
; NAmE NAmE//ˈɪnvəliːd//
 
invalid somebody (out) | invalid somebody (out of something) (British English) to force somebody to leave the armed forces because of an illness or injury He was invalided out of the army in 1943.
Word Originverb mid 17th cent. (as an adjective in the sense ‘infirm or disabled’): a special sense of invalid (adjective), with a change of pronunciation.

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