[ad. med.L. triangulātiōn-em (Abelard, a. 1142), n. of action from *triangulāre to TRIANGULATE. So F. triangulation (1835 in Dict. Acad.).] The action or process of triangulating.

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  1.  The tracing and measurement of a series or network of triangles in order to survey and map out a territory or region.

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1818.  Blackw. Mag., III. 463. The English triangulation, begun by General Roy.

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1826.  T. Drummond, in Phil. Trans., CXVI. II. 334. Slieve Snaght, the highest hill of Innishowen,… forms an important point in the triangulation, which connects the North of Ireland with the western islands of Scotland.

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1863.  A. C. Ramsay, Phys. Geog., xxxi. (1878), 550. The triangulation of Scotland for the Ordnance Survey.

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1864.  J. Hunter, Vogt’s Lect. Man, Index, Triangulation of the skull.

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  2.  Division of a rectilinear figure into triangles.

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1891.  Cent. Dict., Triangulation, 1. A making triangular; formation into triangles.

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