Learn how to say Invalidate correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word invalidate:
1make or prove (an argument, statement, or theory) unsound or erroneous.
2deprive (an official document or procedure) of legal validity because it contravenes a regulation or law:
a technical flaw in her papers invalidated her nomination
mid 17th century: from medieval Latin invalidat- ‘annulled’, from the verb invalidare (based on Latin validus ‘strong’)