Horizontal is the opposite of vertical. In geometry, we use the words vertical and horizontal for standing and sleeping respectively. The line at which the earth's surface and the sky appear to meet is called the horizon. Anything parallel to the horizon is called horizontal.
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The meaning of HORIZONTAL is of or relating to the apparent junction of earth and sky : situated near the horizon. How to use horizontal in a sentence.
flat or level; parallel with the ground: Keep the patient in a horizontal position with her feet slightly raised.
adjective · at right angles to the vertical; parallel to level ground. · flat or level: · being in a prone or supine position; recumbent: · near, on, or ...
When you sleep (unless you're a horse), your body is horizontal: horizontal things are parallel to the ground or running in the same direction as the horizon.