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invalidity

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in⋅va⋅lid⋅i⋅ty

1[in-vuh-lid-i-tee]
–noun
lack of validity.

Origin:
1540–50; < ML invaliditās. See invalid 2 , -ity

in⋅va⋅lid⋅i⋅ty

2[in-vuh-lid-i-tee]
–noun
invalidism.

Origin:
1905–10; invalid 1 + -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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in·val·id 2   (ĭn-vāl'ĭd)   
adj.  
  1. Not legally or factually valid; null: an invalid license.

  2. Falsely based or reasoned; faulty: an invalid argument.


[Latin invalidus, weak : in-, not; see in-1 + validus, strong (from valēre, to be strong; see wal- in Indo-European roots).]
in'va·lid'i·ty (-və-lĭd'ĭ-tē) n., in·val'id·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Legal Dictionary

Main Entry: in·va·lid·i·ty
Pronunciation: "in-v&-'li-d&-tE
Function: noun
: lack of validity : state of being invalid
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Medical Dictionary

Main Entry: in·val·id·i·ty
Pronunciation: "in-v&-'lid-&t-E, -va-
Function: noun
Inflected Form: plural -ties
1 : incapacity to work because of prolonged illness or disability
2 : INVALIDISM
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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