Definition of domain

< -dom

domain name >

do·main    (d-mn) KEY 

NOUN:

1. A territory over which rule or control is exercised.
2. A sphere of activity, concern, or function; a field: the domain of history. See Synonyms at field.
3. Physics Any of numerous contiguous regions in a ferromagnetic material in which the direction of spontaneous magnetization is uniform and different from that in neighboring regions.
4. Law
   1. The land of one with paramount title and absolute ownership.
   2. Public domain.
5. Mathematics
   1. The set of all possible values of an independent variable of a function.
   2. An open connected set that contains at least one point.
6. Computer Science A group of networked computers that share a common communications address.

---

ETYMOLOGY:
French domaine, blend of Old French demaine (from Late Latin dominicum), and Latin dominium, property both from dominus, lord; see dem- in Indo-European roots