the state or quality of being valid: to question the validity of the argument.
legal soundness or force.

1540–50; < Late Latin validitās, equivalent to Latin valid(us) valid + -itās- -ity

nonvalidity, noun, plural nonvalidities.
prevalidity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
valid (ˈvælɪd)
1.  having some foundation; based on truth
2.  legally acceptable: a valid licence
3.  a.  having legal force; effective
 b.  having legal authority; binding
4.  having some force or cogency: a valid point in a debate
5.  logic Compare invalid (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
6.  archaic healthy or strong
[C16: from Latin validus robust, from valēre to be strong]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1550, from M.Fr. validité, from L. validitatem (nom. validitas) "strength," from validus (see valid).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Rather than test the validity of those claims, the sailors quickly set back to
  sea in a longboat.
The reviewers will judge the validity of a project and its budget with a set
  list of criteria which can be seen here.
But to challenge the validity of mathematics or of natural science was quite
  another matter.
Indeed, the dreamer does not even care to admit the validity of this comparison
  when it is pointed out to him.
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