Definitions

from The Century Dictionary.

  • noun Invalidity: as, the invalidness of reasoning.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Invalidity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun invalidity

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun illogicality as a consequence of having a conclusion that does not follow from the premisses

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

invalid +‎ -ness

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