engagement 普通用词，可与本组的另外两个词换用。泛指任何商定的地点和时间见面，专指针对某一目的约会。
appointment 通常指严格根据时间表上预约的时间进行的约见或约会，其目的主要是讨论公事或业务问题。
date 主要指朋友之间的随便约见或男女之间的约会。
参考例句
1. You have to meet him by appointment. 你想会见他，一定要预约时间。
2. Not yet. My appointment is tomorrow. 还没。我约定的时间是明天。
3. I will call your office on Friday, to schedule an appointment. 在星期五我将打电话给您的办公室，预定任命。
英英解释
n.
1. the act of putting a person into a non-elective position
2. a meeting arranged in advance
3. (usually plural) furnishings and equipment (especially for a ship or hotel)
4. a person who is appointed to a job or position
5. the job to which you are (or hope to be) appointed
6. (law) the act of disposing of property by virtue of the power of appointment
