nullification

法官宣布了合同的无效。

The judge declared the ___nullification of the contract.

裁判判定进球无效，因为球员越位在先。

The referee called for the ___nullification of the goal due to an offside position.

该州对联邦教育法案的拒绝执行引发了一场宪法危机。

The state's ___nullification of the federal education act triggered a constitutional crisis.