Definition

1. Noun:
   • A specific area of knowledge or activity: A distinct field, subject, or sphere of interest.
   • A territory owned or controlled by a ruler or government: An area of land under the rule of a particular person or group.
   • (Mathematics) The set of possible input values for a function: All the independent variable values for which a given function is defined.
   • A distinct subset of the internet with a common address suffix: A part of the internet identified by a unique name, like .com or .org.

Usage Examples

• Noun:
  • Her primary domain of expertise is molecular biology.
  • The king's domain stretched from the mountains to the sea.
  • The domain of the function f(x) = √x is all non-negative real numbers.
  • Our company recently registered a new web domain.

Advanced Usage

• "To be outside one's domain": To be outside the area of one's knowledge, expertise, or control.
  • Quantum physics is outside my domain; I'm a historian.
• "Public domain": Refers to creative works not protected by intellectual property laws and freely available for public use.
  • That classic novel is now in the public domain.
• "Domain of discourse": (Logic/Philosophy) The set of entities over which variables may range.
  • In this argument, the domain of discourse is all living mammals.

Variants and Related Words

• Domain name (n): The unique address of a website on the internet.
  • We need to choose a memorable domain name for our business.
• Domain-specific (adj): Designed for or pertaining to a particular field or area.
  • This is a domain-specific language used only for financial modeling.

Synonyms

• Field: A particular branch of study or sphere of activity.
• Realm: A kingdom; or a field or domain of activity or interest.
• Sphere: An area of activity, interest, or expertise; a particular social stratum.
• Territory: An area of land under the jurisdiction of a ruler or state.

Related Phrases

• Come with the domain: (Idiomatic) To be an inherent or expected part of a particular role or position.
  • Long hours and high stress come with the domain of being a CEO.
• Stake a/one's claim to a domain: To assert one's right to an area of expertise or control.
  • With her groundbreaking research, she staked her claim to that academic domain.

Noun

1. the content of a particular field of knowledge
2. people in general; especially a distinctive group of people with some shared interest
   • the Western world
3. (mathematics) the set of values of the independent variable for which a function is defined
4. territory over which rule or control is exercised
   • his domain extended into Europe
   • he made it the law of the land
5. a particular environment or walk of life
   • his social sphere is limited
   • it was a closed area of employment
   • he's out of my orbit