Focus on the pronunciation of invalidate
English definition of “invalidate”
/ɪnˈvælɪdeɪt/ verb [T]
› to officially stop a document, contract, etc. being legally or officially acceptable: If you do not go to an approved garage, you are likely to invalidate a warranty on a new car. → Compare validate invalidation noun [U] › The error led to the invalidation of American scores on an international test.