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TOEFL IELTS BNC: 7986 COCA: 17470

invalid

1 of 4

adjective (1)

in·​val·​id (ˌ)in-ˈva-ləd How to pronounce invalid (audio)
: not valid:
a
: being without foundation or force in fact, truth, or law
an invalid assumption
declared the will invalid
b
: logically inconsequent
invalidly adverb

invalid

2 of 4

noun

in·​va·​lid ˈin-və-ləd How to pronounce invalid (audio)
 British usually  -ˌlēd
: one who is sickly or disabled

invalid

3 of 4

verb

in·​va·​lid ˈin-və-ləd How to pronounce invalid (audio)
-ˌlid,
 British usually  -ˌlēd,
 or  ˌin-və-ˈlēd
invalided; invaliding; invalids

transitive verb

1
: to remove from active duty by reason of sickness or disability
2
: to make sickly or disabled

invalid

4 of 4

adjective (2)

in·​va·​lid ˈin-və-ləd How to pronounce invalid (audio)
 British usually  -ˌlēd
1
: affected by disease or disability : sickly
2
: of, relating to, or suited to one that is sick
an invalid chair

Example Sentences

Noun Her husband has become an invalid.

Word History

Etymology

Adjective (1)

Latin invalidus weak, from in- + validus strong — more at valid

Adjective (2)

Latin & French; French invalide, from Latin invalidus

First Known Use

Adjective (1)

1542, in the meaning defined above

Noun

1701, in the meaning defined above

Verb

1787, in the meaning defined at sense 1

Adjective (2)

1642, in the meaning defined at sense 1

Time Traveler
The first known use of invalid was in 1542

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