1. a field of action, thought, influence, etc.: the domain of science.
  2. the territory governed by a single ruler or government; realm.
  3. a realm or range of personal knowledge, responsibility, etc.
  4. a region characterized by a specific feature, type of growth or wildlife, etc.: We entered the domain of the pine trees.
  5. Law. land to which there is superior title and absolute ownership.
  6. Mathematics.
    1. the set of values assigned to the independent variables of a function.
    2. region(def 11a).
  7. Computers.
    1. a group of computers and devices on a network that are administered under the same protocol.
    2. the top level in a domain name, indicating the type of organization, geographical location, or both, and officially designated in the suffix, as .edu for institutions of higher education.
  8. Physics. one of many regions of magnetic polarity within a ferromagnetic body, each consisting of a number of atoms having a common polarity, and collectively determining the magnetic properties of the body by their arrangement.
  9. Crystallography. a connected region with uniform polarization in a twinned ferroelectric crystal.


  1. land governed by a ruler or government
  2. land owned by one person or family
  3. a field or scope of knowledge or activity
  4. a region having specific characteristics or containing certain types of plants or animals
  5. Australian and NZ a park or recreation reserve maintained by a public authority, often the government
  6. law the absolute ownership and right to dispose of landSee also demesne, eminent domain
  7. maths
    1. the set of values of the independent variable of a function for which the functional value existsthe domain of sin x is all real numbers Compare range (def. 8a)
    2. any open set containing at least one point
  8. logic another term for universe of discourse domain of quantification
  9. philosophy range of significance (esp in the phrase domain of definition)
  10. Also called: magnetic domain physics one of the regions in a ferromagnetic solid in which all the atoms have their magnetic moments aligned in the same direction
  11. computing a group of computers, functioning and administered as a unit, that are identified by sharing the same domain name on the internet
  12. Also called: superkingdom biology the highest level of classification of living organisms. Three domains are recognized: Archaea (see archaean), Bacteria (see bacteria), and Eukarya (see eukaryote)
  13. biochem a structurally compact portion of a protein molecule

early 15c., in Scottish, from Middle French domaine “domain, estate,” from Old French demaine “lord’s estate,” from Latin dominium “property, dominion,” from dominus “lord, master, owner,” from domus “house” (see domestic). Form influenced in Old French by Medieval Latin domanium “domain, estate.” Internet domain name attested by 1985.


  1. One of the homologous regions that make up an immunoglobulin’s heavy and light chains and serve specific immunological functions.

  1. Mathematics The set of all values that an independent variable of a function can have. In the function y = 2x, the set of values that x (the independent variable) can have is the domain. Compare range.
  2. Computer Science A group of networked computers that share a common communications address.
  3. Biology A division of organisms that ranks above a kingdom in systems of classification that are based on shared similarities in DNA sequences rather than shared structural similarities. In these systems, there are three domains: the archaea, the bacteria, and the eukaryotes.
  4. Physics A region in a ferromagnetic substance in which the substance is magnetized with the same polarization throughout.

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