Definition
A realm is a kingdom — the whole territory under one ruler — and from that royal beginning it has stretched to mean any bounded domain: the realm of physics, the realm of dreams, the realm of possibility. The word still keeps its borders; whatever lies inside a realm answers to its own rules and its own authority, and a clear boundary separates it from what lies beyond. It is a touch grand and literary, which is why figurative realms always sound a little like small kingdoms.
Examples
- In the realm of medieval politics, loyalty often mattered more than law.
- Some questions transcend the realm of pure science and spill over into philosophy.
- Quantum effects belong to the realm of the very small, where everyday intuition simply fails.
Collocations
the realm of possibility·in the realm of·beyond the realm of·a realm of ideas·the public realm
Synonyms
kingdom·domain·sphere·province·territory
In TOEFL & IELTS
The figurative frame 'in the realm of…' is a graceful way to name a field in Writing ('in the realm of public health'), and 'within the realm of possibility' is a ready-made hedge. The literal kingdom sense turns up in history and literature reading. One syllable, silent middle — it rhymes with 'helm', not 'realum'.