n.[C]

1. 領土，領地；領土權
   The conspirators were banished from the king's domain.

   陰謀家們被趕出了國王的領土。

2. （政府或私人的）所有地，地產
3. 領域，範圍
   I can't answer your question about photography. It's not in my domain.

   我無法回答你有關攝影的問題。我不做那一行。

4. 地區，區域
5. 【數】域；【物】（磁）疇

n.

1. an area owned or controlled by a ruler or government.
   ▸a sphere of activity or knowledge.
2. Computing  a distinct subset of the Internet with addresses sharing a common suffix.
3. Mathematics  the possible values of the independent variable or variables of a function.
4. Physics  a discrete region of magnetism in ferromagnetic material.
5. Biochemistry  a distinct region of a complex molecule or structure.