n.

1. 等级制度
2. 僧侣统治（集团）
3. 统治集团
4. 【生】级系，阶系

n.

1. a ranking system ordered according to status or authority.
   ▸ (the hierarchy) the upper echelons of a hierarchical system.
   ▸an arrangement according to relative importance or inclusiveness.
2. (the hierarchy) the clergy of the Catholic Church or of an episcopal Church.
3. Theology  the traditional system of orders of angels and other heavenly beings.