va·lid·i·ty

[vuh-lid-i-tee]
noun
1.
the state or quality of being valid: to question the validity of the argument.
2.
legal soundness or force.

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

non·va·lid·i·ty, noun, plural non·va·lid·i·ties.
pre·va·lid·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
valid (ˈvælɪd) [Click for IPA pronunciation guide]
 
adj
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]
 
'validly
 
adv
 
validity
 
n
 
'validness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Validity is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

validity
c.1550, from M.Fr. validité, from L. validitatem (nom. validitas) "strength," from validus (see valid).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
And you wonder why intelligent people are questioning the scientific
  community's validity as they are.
These efforts will be replaced by the validity of ideas of merit thoroughly
  studied by the voters.
Before considering the validity of this idea, its origins should be noted.
Probability does pervade the universe-and in this sense, the old chestnut about
  baseball imitating life really has validity.
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