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.

Noun

(en noun)

(typography) The edge of the paper that remains blank.

The edge or border of any flat surface.

* {{quote-book, year=1913, author=

, title=Lord Stranleigh Abroad , chapter=4 citation , passage=Nothing could be more business-like than the construction of the stout dams, and nothing more gently rural than the limpid lakes, with the grand old forest trees marshalled round their margins like a veteran army that had marched down to drink, only to be stricken motionless at the water’s edge.}}

*

The lobule margins , furthermore, are arched away from the lobe, with the consequence that (when fully inflated) the abaxial leaf surface forms the interior lining of the lobule.

(figuratively) The edge defining inclusion in or exclusion from of a set or group.

* 1999 , Pierre François, ''Inlets of the Soul: Contemporary Fiction in English and the Myth of the Fall, page 186,

As far as space is concerned, Mary Lamb finds herself at the farthest margin of society - among tramps - when the novel begins.

A difference between results, characteristics, scores.

* {{quote-news

, year=2012 , date=April 15 , author=Phil McNulty , title=Tottenham 1-5 Chelsea , work=BBC citation , page= , passage=Chelsea will point to that victory margin as confirmation of their superiority - but Spurs will complain their hopes of turning the game around were damaged fatally by Atkinson's decision.}}

A permissible difference; allowing some freedom to move within limits.

margin of error

(finance) The yield or profit; the selling price minus the cost of production.

(finance) Collateral security deposited with a broker to secure him from loss on contracts entered into by him on behalf of his principial, as in the speculative buying and selling of stocks, wheat, etc.