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n.
a knowledge domain that you are interested in or are communicating about; "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult"
n.
a distinct region or subdivision of a territorial or political area or community or group of people; "no section of the nation is more ardent than the South"; "there are three synagogues in the Jewish section"
n.
the set of all points or lines that satisfy or are determined by specific conditions; "the locus of points equidistant from a given point is a circle"
n.
the solid part of the earth's surface; "the plane turned away from the sea and moved back over land"; "the earth shook for several minutes"; "he dropped the logs on the ground"