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Adjective vertical has 2 senses
vertical, perpendicular - at right angles to the plane of the horizon or a base line; "a vertical camera angle"; "the monument consists of two vertical pillars supporting a horizontal slab"; "measure the perpendicular height"Antonyms:  inclined, atilt, canted, leaning, tilted, tipped, aslant, aslope, diagonal, slanted, slanting, sloped, sloping, high-pitched, low-pitched, pitched, salient, sidelong, skew, skewed, monoclinal, horizontal, crosswise, flat, level, naiant, swimming
 
erect, vertical, upright - upright in position or posture; "an erect stature"; "erect flower stalks"; "for a dog, an erect tail indicates aggression"; "a column still vertical amid the ruins"; "he sat bolt upright"
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