domain meaning and definition

DOMAIN noun

Definition of domain (noun)

1. 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"
   • synonyms: area, arena, field, orbit, sphere
2. territory over which rule or control is exercised
   • "his domain extended into Europe"; "he made it the law of the land"
   • synonyms: demesne, land
3. (mathematics) the set of values of the independent variable for which a function is defined
   • synonyms: domain of a function
4. people in general; especially a distinctive group of people with some shared interest
   • "the Western world"
   • synonyms: world
5. the content of a particular field of knowledge
   • synonyms: knowledge base, knowledge domain