#1
realm n. [
kingdom, land] a domain in which something is dominant; "the untroubled kingdom of reason"; "a land of make-believe"; "the rise of the realm of cotton in the south"
. wn #2
realm n. [
kingdom] the domain ruled by a king or queen
. wn #3
realm n. [
region] 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"
. wn