definition of
domain

[1] #1 domain n. [sphere, area, orbit, field, arena] 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". wn

[2] #2 domain n. [demesne, land] territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land". wn

[3] #3 domain n. [domain of a function] (mathematics) the set of values of the independent variable for which a function is defined. wn

[4] #4 domain n. [world] people in general; especially a distinctive group of people with some shared interest; "the Western world". wn

[5] #5 domain n. [knowledge domain, knowledge base] the content of a particular field of knowledge. wn