heir
noun uk/eər/ us/er/
C2 [ C ]继承人
a person who will legally receive money, property, or a title from another person, especially an older member of the same family, when that other person dies
The guest of honour was the Romanov heir to the throne of all Russia. 这位贵客是统治全俄罗斯的罗曼诺夫王朝的王位继承人。
Despite having a large family, they still had no son and heir. 尽管家庭成员众多，他们仍然没有儿子做继承人。
Compare: heiress
[ C usually singular ]（负责继续处理某一问题或局面的）继承者
someone who now has responsibility for dealing with a problem or situation that existed or was created earlier
The French finance minister is heir to a tradition of central control that goes back to Louis XIV. 法国的财政部长继承了中央集权财政管理方式的传统，该传统可以追溯到路易十四时代。
[ C usually singular ]（接替某重要位置的）接班人，继任者
someone who continues to do the work of someone important who has died, or someone who has the same position as the previous person who held that position