From Longman Business Dictionary
revokere·voke /rɪˈvəʊk-ˈvoʊk/ verb [transitiveT]LAW to officially state that a law, official document, agreement etc is no longer effectiveWe had no alternative but to revoke the contract.
—revocable adjectiveadjFour events are mentioned that make the agreement revocable.
—revocation noun [countableC, uncountableU]She faces revocation of her licence.