realm [
relm ] (plural realms)
noun
Definition:
1. scope of something: an area or domain, e.g. of thought or knowledge
Here the scenario enters the realms of fantasy.
2. area of interest: a defined area of interest or study
the realm of pure mathematics
3. kingdom: a country ruled by a monarch
[13th century. Via Old French realme< Latin regimen 'government' (see
regimen)]