Annul (verb)

1. To declare (a marriage, for example) to be null and void, especially by the Catholic Church.
2. To make void or invalid, as by a legal action, decree, or other means.
3. To cancel or invalidate a decision or agreement, making it null and void.

Origin:

From the latin annullare, meaning "to make void" or "to cancel".

Examples:

1. The court annulled the marriage because of fraud.
2. The company had to annul the contract due to a mistake in the paperwork.
3. The election was annulled due to voter fraud.
4. The company"s board of directors voted to annul the previous CEO"s decision.
5. The government annulled the law which was found to be unconstitutional.