Look up: invalid

1. 
   invalid
   [adj] - having no cogency or legal force 2. [adj] - no longer valid 3. [n] - someone who is incapacitated by a chronic illness or injury 4. [v] - force to retire, remove from active duty, as of firemen
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. 
   Invalid
   In·val'id adjective [ Prefix in- not + valid : confer French invalide , Latin invalidus infirm, weak. Confer Invalid infirm.] 1. Of no force, weight, or cogency; not valid; weak. 2. (Law) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
   Found on http://www.encyclo.co.uk/webster/I/90
   
   
3. 
   Invalid
   In'va·lid noun [ French invalide , noun & adjective , Latin invalidus , adjective See Invalid null.] A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
   Found on http://www.encyclo.co.uk/webster/I/90
   
   
4. 
   Invalid
   In'va·lid adjective [ See Invalid , noun ] Not well; feeble; infirm; sickly; as, he had an invalid daughter.
   Found on http://www.encyclo.co.uk/webster/I/90
   
   
5. 
   Invalid
   In'va·lid transitive verb 1. To make or render invalid or infirm. ' Invalided , bent, and almost blind.' Dickens. 2. To classify or enroll as an invalid. « Peace coming, he was invalided on half pay.» Carlyle.
   Found on http://www.encyclo.co.uk/webster/I/90
   
   
6. 
   invalid
   1. Weak; sick. ... 2. A person partially or completely disabled. ... Origin: L. In-neg. + validus, strong ... (05 Mar 2000) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
7. 
   invalid
   adjective no longer valid; `the license is invalid`
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
8. 
   invalid
   adjective having no cogency or legal force; `invalid reasoning`; `an invalid driver`s license`
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
9. 
   invalid
   verb force to retire, remove from active duty, as of firemen
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
10. 
    Invalid
    `Invalid` may refer to: *Patient, a sick person *A person with a disability As the opposite of `valid`: *Validity, in logic, true premises cannot lead to a false conclusion *Validity (statistics), a measure which is measuring what it is supposed to measure
    Found on http://en.wikipedia.org/wiki/Invalid
    
    
11. 
    Invalid
    • (n.) Not well; feeble; infirm; sickly; as, he had an invalid daughter. • (v. t.) To make or render invalid or infirm. • (a.) Of no force, weight, or cogency; not valid; weak. • (a.) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement. • (v. t.) To classify or enroll as an invalid. •...
    Found on http://thinkexist.com/dictionary/meaning
    
    
12. 
    invalid
    invalid (in VAL id) 1. Not factually or legally valid; null. 2. Falsely based or reasoned; faulty.
    Found on http://www.wordinfo.info/words/index/inf