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horizontal

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.)