validity definition, validity meaning | English dictionary

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1    having some foundation; based on truth  
2    legally acceptable  
a valid licence     
a    having legal force; effective  
b    having legal authority; binding  
4    having some force or cogency  
a valid point in a debate     
5      (Logic)   (of an inference or argument) having premises and conclusion so related that whenever the former are true the latter must also be true, esp. (formally valid) when the inference is justified by the form of the premises and conclusion alone. Thus Tom is a bachelor; therefore Tom is unmarried is valid but not formally so, while today is hot and dry; therefore today is hot is formally valid  
   Compare       invalid   2       2  
6    Archaic   healthy or strong  
     (C16: from Latin validus robust, from valere to be strong)  
  validly      adv  
  validness      n  

face validity  
      n     (Psychol)   the extent to which a psychological test appears to measure what it is intended to measure  
English Collins Dictionary - English Definition & Thesaurus  


1    cogency, force, foundation, grounds, point, power, soundness, strength, substance, weight  
2    authority, lawfulness, legality, legitimacy, right  

English Collins Dictionary - English synonyms & Thesaurus  

validity n.
The state of being acceptable or officially true; the statement that is powerful to convince someone something is right.

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