Repudiation (noun)

1. The rejection of something as invalid.
2. The action of rejecting or disowning someone or something.
3. The rejection of a claim or charge.

Origin:

Late middle english: from old french, or from latin repudiatio(n-), from repudiare "divorce, reject".

Examples:

1. The government's repudiation of the treaty caused an international crisis.
2. The politician's repudiation of his former beliefs was met with skepticism.
3. The company's repudiation of the contract was a surprise.
4. The repudiation of the accusations was a significant victory for the defendant.
5. His repudiation of his father's legacy was a disappointment to many.