a final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations 最后通牒;哀的美敦书 the British government issued an ultimatum to Hitler to cease invasion of Poland. 英国政府向希特勒发出停止侵略波兰的最后通牒。
语源
mid 18th cent.: from Latin, neuter past participle of ultimare 'come to an end'