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Từ điển Oxford Advanced Learner 8th
invalid
in·valid [invalid invalids invalided invaliding] adjective, noun, verb
adjective BrE [ɪnˈvælɪd] ; NAmE [ɪnˈvælɪd]
1. not legally or officially acceptable
•The treaty was declared invalid because it had not been ratified.
•People with invalid papers are deported to another country.
2. not based on all the facts, and therefore not correct
•an invalid argument
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
Opp: ↑valid
Word Origin:
n. and v. mid 17th cent. ‘infirm or disabled’ ↑invalidadj. mid 16th cent. valid Latin invalidus in- ‘not’ validus ‘strong’ valere ‘be strong’
Example Bank:
•This action would render the agreement invalid.
noun BrE [ˈɪnvəlɪd] ; [ˈɪnvəliːd] ; NAmE [ˈɪnvəlɪd]
a person who needs other people to take care of them, because of illness that they have had for a long time
•She had been a delicate child and her parents had treated her as an invalid.
•his invalid wife
Word Origin:
n. and v. mid 17th cent. ‘infirm or disabled’ ↑invalidadj. mid 16th cent. valid Latin invalidus in- ‘not’ validus ‘strong’ valere ‘be strong’
Example Bank:
•He was found guilty of murdering his invalid father.
•Her husband was an invalid and couldn't come to the door to open it.
verb BrE [ˈɪnvəlɪd] ; NAmE [ˈɪnvəlɪd] BrE [ˈɪnvəliːd] ; NAmE [ˈɪnvəliːd] ~ sb (out) | ~ sb (out of sth) (BrE)
to force sb to leave the armed forces because of an illness or injury
•He was invalided out of the army in 1943.
Verb forms: 
Word Origin:
n. and v. mid 17th cent. ‘infirm or disabled’ ↑invalidadj. mid 16th cent. valid Latin invalidus in- ‘not’ validus ‘strong’ valere ‘be strong’
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