domain
/dəʊˈmeɪn/noun
1- an area of territory owned or controlled by a ruler or government领土, 领地：
the south-western French domains of the Plantagenets.
金雀花王朝统治下的法国西南边的领土。
1.1
- a specified sphere of activity or knowledge（活动）范围; （知识）领域：
the country's isolation in the domain of sport.
该国在运动领域的孤立。
1.2
- Physics a discrete region of magnetism in ferromagnetic material【物理】区域; 畴。
1.3
- Computing a distinct subset of the Internet with addresses sharing a common suffix, such as the part in a particular country or used by a particular group of users【计算机】域。
1.4
- Mathematics the set of possible values of the independent variable or variables of a function【数】域。
词源
late Middle English (denoting heritable or landed property)： from French domaine, alteration （by association with Latin dominus 'lord'） of Old French demeine 'belonging to a lord' （see DEMESNE）.