Main entry: domain, knowledge base, knowledge domain
Definition: the content of a particular field of knowledge
Definition: people in general; especially a distinctive group of people with some shared interest
Usage: the Western world
Main entry: domain, domain of a function
Definition: (mathematics) the set of values of the independent variable for which a function is defined
Main entry: domain, demesne, land
Definition: territory over which rule or control is exercised
Usage: his domain extended into Europe; he made it the law of the land
Main entry: orbit, field, area, arena, sphere, domain
Definition: a particular environment or walk of life
Usage: his social sphere is limited; it was a closed area of employment; he's out of my orbit