1. (大学或学院的）院长，教务长A dean is an important official at a university or college.
e.g. She was Dean of the Science faculty at Sophia University.她是上智大学科学院的院长。
2. 教长;座堂主任牧师A dean is a priest who is the main administrator of a large church.
e.g. ...Alan Webster, former Dean of St Paul's.艾伦·韦伯斯特，圣保罗大教堂前教长
3. 泰斗;首席;资历最深者The dean of a group is the most important member of that group.
e.g. ...Aaron Copland, who was known as the dean of American composers.阿隆·科普兰，美国最资深的作曲家