Domain has several meanings:

• some kind of territory
• synonymous with field, e.g. the domain of computer science
• public domain, a body of works and knowledge without proprietary interest
• domain of discourse in symbolic logic
• eminent domain, the power of government to confiscate private property for public use
• broadcast domain in computer networking
• domain name, part of the name of a machine on the Internet
• in mathematics a domain can be
  • the domain of a mathematical function
  • an ordered structure studied in domain theory
  • an integral domain and Euclidean domain, types of mathematical ring
• in biology, a domain is a subdivision even larger than a kingdom
• in biochemistry and protein science, a domain is an autonomously folding functional module of a protein
• in physics a domain is a region of a solid inside which a property is uniform (for example magnetic domain in ferromagnetism)
• application domain, the kind of uses a computer program or something else is used for

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