A community or territory over which a sovereign rules; a kingdom.(noun)
A field, sphere, or province: the realm of science. See Synonyms at field.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "realm" in a sentence
"It is the realm of _psychical life_; and, still more decidedly and more evidently, the _realm of mind_."
"A series of recent mind-bending laboratory experiments has given scientists an unprecedented peek behind the quantum veil, confirming that this realm is as mysterious as imagined."
"The subconscious never sleeps and this realm is a vast resource for a writer."