realm /relm/ BrE AmE noun [countable]
[ Date: 1200-1300 ; Language: Old French ; Origin: realme , from Latin regimen ; ⇨ ↑ regimen ]
1 . written a general area of knowledge, activity, or thought:
the spiritual realm
realm of
an idea that belongs in the realm of science fiction
2 . within the realms of possibility ( also not beyond the realm(s) of possibility ) used, often humorously, to say that something is possible even though you think it is not very likely:
I suppose it’s not beyond the realms of possibility.
3 . literary a country ruled by a king or queen