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        hor·i·zon·tal

        horizontal

         
         
        pronunciation:
        ha r zan tl [or] ho r zan tl
        part of speech: adjective
        definition: parallel to the surface of the earth or to the horizon.
        Most people sleep in a horizontal position.
        synonyms:
        level
        antonyms:
        perpendicular, vertical
        similar words:
        flat, plane
        derivation: horizontally (adv.)