To make void or of no effect; to nullify; to abolish; to do away with; used appropriately of laws, decrees, edicts, decisions of courts, or other established rules, permanent usages, and the like, which are made void by component authority
If an election or a contract is annulled, it is declared invalid, so that legally it is considered never to have existed. The marriage was annulled last month. to officially state that a marriage or legal agreement no longer exists (annuller, from annullare, from ad- + nullus )