Английский Этимологический словарь - border

- c.1350, from O.Fr. bordure "seam, edge, border," from Frankish (cf. O.E. bord "side"), from P.Gmc. *bordus "edge," from *borthaz. The geopolitical sense first attested 1535, in Scottish (replacing earlier march), from The Borders, district adjoining the boundary between England and Scotland.