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Adjective horizontal has 1 sense
- horizontal - parallel to or in the plane of the horizon or a base line; "a horizontal surface"
Antonyms: vertical, perpendicular, plumb, upended, upright, unsloped, inclined, atilt, canted, leaning, tilted, tipped, aslant, aslope, diagonal, slanted, slanting, sloped, sloping, high-pitched, low-pitched, pitched, salient, sidelong, skew, skewed, monoclinal
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