Etymology
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border (n.)

mid-14c., bordure, in heraldry, "broad, colored band surrounding the shield," from Old French bordeure "seam, edge of a shield, border," from Frankish *bord or a similar Germanic source (compare Old English bord "side;" see board (n.2)). The form of the ending changed after c. 1500. From late 14c. as "edge, side, brink, margin," also "ornamental border along the edge of a dish, garment, etc." Italian and Spanish bordo also are from Germanic.

Sense of "boundary of a city or country" is from late 14c. From c. 1400 as "border region, district lying along the boundary of a country" (replacing earlier march). In U.S. history, "the line between the wild and settled regions of the country" (1827).

border (v.)

c. 1400, "to put a border on;" 1530s as "to lie on the border of," from border (n.). Related: Bordered; bordering.

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Definitions of border
1
border (v.)
extend on all sides of simultaneously; encircle;
Synonyms: surround / environ / ring / skirt
border (v.)
form the boundary of; be contiguous to;
Synonyms: bound
border (v.)
enclose in or as if in a frame;
Synonyms: frame / frame in
border (v.)
provide with a border or edge;
Synonyms: edge
border (v.)
lie adjacent to another or share a boundary;
Synonyms: adjoin / edge / abut / march / butt / butt against / butt on
2
border (n.)
a line that indicates a boundary;
Synonyms: boundary line / borderline / delimitation / mete
border (n.)
the boundary line or the area immediately inside the boundary;
Synonyms: margin / perimeter
border (n.)
the boundary of a surface;
Synonyms: edge
border (n.)
a decorative recessed or relieved surface on an edge;
Synonyms: molding / moulding
border (n.)
a strip forming the outer edge of something;
the rug had a wide blue border
From wordnet.princeton.edu