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invalidity1

[in-vuh-lid-i-tee] /ˌɪn vəˈlɪd ɪ ti/
noun
1.
lack of validity.
Origin
1540-1550
1540-50; < Medieval Latin invaliditās. See invalid2, -ity

invalidity2

[in-vuh-lid-i-tee] /ˌɪn vəˈlɪd ɪ ti/
noun
Origin
1905-10; invalid1 + -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for in validity

invalidity

n.

1540s, from Latin invalidatus (see invalid (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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