invalidity

Meanings

1. 1
   noun

   the state of lacking legal, formal, or factual validity

   The court declared the invalidity of the unsigned agreement.

2. 2
   noun

   the logical defect of an argument whose conclusion does not follow from its premises

   A counterexample was enough to demonstrate the invalidity of the inference.

Formed from invalid + -ity. Invalid in the sense 'not valid' combines the negative prefix in- with valid, from Latin validus, 'strong or effective,' from valere, 'to be strong.' Invalidity names the absence of binding force, factual support, or logical soundness.

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