/ˈvi:təʊ ||; ˈvito/verb [T] (present participle vetoing third person singular present vetoes;past tense past participle vetoed) to refuse to give official permission for an action or plan, when other people have agreed to it 否决: The Prime Minister vetoed the proposal to reduce taxation. 首相否决了减税的提案。 veto noun [C,U] (plural vetoes) the right of veto 否决权