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An object is in a vertical position when it is aligned in an "up-down" direction, perpendicular to the horizon.
Compare horizontal.
A pair of angles are said to be vertical if they share the same
vertex and are bounded by the same pair of lines but are opposite to each other. If a
pair of angles are vertical, then they are equal (congruent).
In music the vertical aspect is simultaneity, either intervals or harmony,
as opposed to succession or the linear aspect
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