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realm

/relm//relm/·noun
a kingdom; or a domain or field of activity or knowledge
Fig. 1 — A keep stands on its hill, and a single line draws itself in one clean sweep all the way around the land below — this much is ours, and no more.
01Definition

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.

02In use
  • iIn the realm of medieval politics, legitimacy often mattered more than military might.
  • iiSome questions transcend the realm of pure science and spill over into philosophy.
  • iiiQuantum effects belong to the realm of the very small, where everyday intuition simply fails.
03Collocations
  • the realm of possibility
  • in the realm of
  • beyond the realm of
  • a realm of ideas
  • the public realm
04Relations

=kingdom, domain, sphere, province, territory

05Compared
PairThe difference
realm vs domaina field of control or expertise (or a web address) → domain; a kingdom or grand bounded world → realm.
06TOEFL & 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'.

07Asked
Does realm mean a kingdom or a field of study?
Kingdom first, everything else by inheritance. The literal realm is territory under one crown; the figurative realms — of physics, of dreams, of the possible — borrow that geometry: their contents answer to their own rules, and a border separates them from everything else. The scene above keeps both readings at once: a line that decides what is inside, and a flag that says who rules it.
What does 'within the realm of possibility' mean?
Not impossible — a hedge that admits something could happen without promising it will. It often appears negated for extra caution: 'not beyond the realm of possibility' concedes even less. The mirror phrase does the excluding: beyond the realm of possibility means it cannot happen. Both work because the metaphor holds — possibility is a territory, and things are either inside its border or out.
Is realm the same as domain?
Near twins with different accents — realm keeps a royal, literary ring while domain leans technical and administrative; the full weighing is on the domain vs realm page in the 'Compared' list above.
What is the public realm?
Everything owned in common and lived in publicly — streets, squares, parks, and by extension the shared space of debate. Urban planners use it for the physical fabric between buildings; political writers for the arena where citizens meet as citizens. The phrase works because a realm needs an authority, and here the authority is everyone: territory ruled, in principle, by the public itself.