#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 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 domain n. [domain of a function] (mathematics) the set of values of the independent variable for which a function is defined. wn
#4 domain n. [world] people in general; especially a distinctive group of people with some shared interest; "the Western world". wn
#5 domain n. [knowledge domain, knowledge base] the content of a particular field of knowledge. wn
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