invalidation - WordReference.com Dictionary of English

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- - Inuktitut
  - inulin
  - inunction
  - inundate
  - Inupiaq
  - inure
  - invade
  - invagination
  - invalid
  - invalidate
  - invalidity
  - invaluable
  - Invar
  - invariable
  - invariably
  - invariant
  - invasion
  - invasive
  - invected
  - invective
  - inveigh
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invalidation

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Concise Oxford English Dictionary © 2008 Oxford University Press:
invalidate /ɪnˈvalɪdeɪt/

▶verb

1 make or prove (an argument, theory, etc.) unsound or erroneous.

2 make (an official document or procedure) no longer legally valid.

– derivatives
invalidation noun.

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