nullify

/ˈnʌlɪfaɪ/ verb [T]

Definition

› LAW to make a legal agreement or decision no longer have any legal force: The airline wants to nullify employees' contracts if no settlement is reached.

› to cause something to have no value or effect: A suit has been filed against the directors, charging them with conspiring to nullify a shareholder vote. The US stated that any reductions in greenhouse gases by the West must not be nullified by increased emissions from developing nations.

nullification noun [U]

(Definition of nullify verb from the Cambridge Business English Dictionary © Cambridge University Press)