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Vertical

VERTICAL (from Lat. vertex, highest point), the direction of the line of action of gravity, as determined by the plumbline. The angle of the vertical is the angle between the direction of the plumb-line and that of the earth's centre (see EARTH, FIGURE or THE).

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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