WordReference Random House Learner's Dictionary of American English © 2020 in•va•lid1 /ˈɪnvəlɪd/USA pronunciation
n. [countable]WordReference Random House Unabridged Dictionary of American English © 2020
- an unhealthy person, esp. one who is too sick or weak to care for himself or herself.
v. [~ + object]
- unable to care for oneself, as through ill health.
- of or for invalids.
in•val•id2 /ɪnˈvælɪd/USA pronunciation
- to make (someone) an invalid.
- Military[Chiefly Brit.]to evacuate (military personnel) from an area of fighting because of injury or illness.
in•va•lid•i•ty /ˌɪnvəˈlɪdɪti/USA pronunciation n. [uncountable]
- not valid; without force or a firm foundation;
that cannot be defended;
weak in logic:an invalid conclusion.
- empty or without legal force:The contract was declared invalid.
(in′və lid; Brit. in′və lēd′),USA pronunciation n.
- an infirm or sickly person.
- a person who is too sick or weak to care for himself or herself:My father was an invalid the last ten years of his life.
- [Archaic.]a member of the armed forces disabled for active service.
- unable to care for oneself due to infirmity or disability:his invalid sister.
- of or for invalids:invalid diets.
- (of things) in poor or weakened condition:the invalid state of his rocking chair.
- to affect with disease;
make an invalid:He was invalided for life.
- to remove from or classify as not able to perform active service, as an invalid.
- Military[Brit.]to remove or evacuate (military personnel) from an active theater of operations because of injury or illness.
- to become an invalid.
(in val′id),USA pronunciation adj.
- Latin invalidus weak. See in-3, valid
- French invalide
- not valid;
without force or foundation;
- deficient in substance or cogency;
- void or without legal force, as a contract.
- Medieval Latin invalidus, Latin: weak; see invalid1
Collins Concise English Dictionary © HarperCollins Publishers::
invalid /ˈɪnvəˌliːd -lɪd/ n
- a person suffering from disablement or chronic ill health
- (as modifier): an invalid chair
- suffering from or disabled by injury, sickness, etc
Etymology: 17th Century: from Latin invalidus infirm, from in-1 + validus strongˌinvaˈlidity n
- to cause to become an invalid; disable
- (usually followed by out; often passive) chiefly Brit to require (a member of the armed forces) to retire from active service through wounds or illness
invalid /ɪnˈvælɪd/ adj
Etymology: 16th Century: from Medieval Latin invalidus without legal force; see invalid1invalidity /ˌɪnvəˈlɪdɪtɪ/, inˈvalidness n inˈvalidly adv
- not valid; having no cogency or legal force
- (of an argument) having a conclusion that does not follow from the premises: it may be false when the premises are all true; not valid
'invalid' also found in these entries: