Noun

(en noun)

An abstract sphere of influence, real or imagined.

* 1907 , Tada Kanai, translated by Arthur Lloyd, Seven Buddhist Sermons , ""

Why should we despise anything in the realm of Buddha?

* 2006 , Christian Neef, " Diary of a Collapsing Superpower", Spiegel Magazine , November 22,

At home in Moscow, Mikhail Sergeyevitch Gorbachev, who had launched a campaign to rejuvenate the Soviet realm  

* {{quote-magazine, date=2013-05-17

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The domain of a certain abstraction.

* 1922 , Judson Eber Conant,The Church The Schools and Evolution , "",

One thing more which the scientific man does is to accord primacy to that realm of truth which is primary in importance.

(formal, or, legal) A territory or state, as ruled by a specific power, and particularly those territories ruled by a king.

* 1874 , ,

And, of this island realm , he and his companion were the undisputed sovereigns.

* 1913 , Leslie Alexander Toke, Catholic Encyclopedia , "",

Then seeing his life was threatened he fled the realm and crossed over to Flanders,

Noun

(en noun)

That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.

* 1979 , Richard Elphic and Hermann Guilomee (editors), The shaping of South African Society, 1652 - 1820 , page 297:

Unlike a boundary, which evokes the image of a line on a map and demarcates spheres of political control, the frontier is an area where colonisation is taking place....no authority is recognised as legitimate by all parties or is able to excersise undisputed control over the area.

(obsolete) An outwork of a fortification.

* Shakespeare

Palisadoes, frontiers , parapets.