First Known Use: 1542
Dictionary
1invalid
adjective in·val·id \(ˌ)in-ˈva-ləd\
Definition of INVALID
: not valid: a : being without foundation or force in fact, truth, or law <an invalid assumption> <declared the will invalid> b : logically inconsequent
— in·val·id·ly \-lē\ adverb
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Origin of INVALID
Latin invalidus weak, from in- + validus strong — more at valid
Rhymes with INVALID
2invalid
adjective in·va·lid \ˈin-və-ləd, British usually -ˌlēd\
Definition of INVALID
1
: suffering from disease or disability : sickly
2
: of, relating to, or suited to one that is sick <an invalid chair>
Origin of INVALID
Latin & French; French invalide, from Latin invalidus
First Known Use: 1642
3invalid
noun \same as 2\
: a person who needs to be cared for because of injury or illness
Full Definition of INVALID
: one who is sickly or disabled
See invalid defined for English-language learners
First Known Use of INVALID
1701
4invalid
verb in·va·lid \ˈin-və-ləd, -ˌlid, British usually -ˌlēd or ˌin-və-ˈlēd\
: to release (someone) from active military service because of illness or injury
Full Definition of INVALID
transitive verb
1
: to remove from active duty by reason of sickness or disability
2
: to make sickly or disabled
See invalid defined for English-language learners
First Known Use of INVALID
1787
INVALID Defined for Kids
1invalid
adjective in·val·id \in-ˈva-ləd\
Definition of INVALID for Kids
: having no force or effect
2invalid
noun in·va·lid \ˈin-və-ləd\
Definition of INVALID for Kids
: a person suffering from sickness or disability
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