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hor·i·zon·tal
[hawr-uh-zon-tl, hor-]
ADJECTIVE
1.
at right angles to the vertical; parallel to level ground.
2.
flat or level: a horizontal position.
3.
being in a prone or supine position; recumbent: His bad back has kept him horizontal for a week.
4.
near, on, or parallel to the horizon.
5.
of or relating to the horizon.
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Source: Dictionary.com
Horizontal plane - Wikipedia
In geometry, physics, astronomy, geography, and related sciences, a plane is said to be horizontal at a given point if it is perpendicular to the gradient of the ... More »
horizontal | Define horizontal at Dictionary.com
dictionary.reference.com/browse/horizontal
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Horizontal | Define Horizontal at Dictionary.com

www.dictionary.com/browse/horizontal

Horizontal definition, at right angles to the vertical; parallel to level ground. See more.

Horizontal and vertical - Wikipedia

en.wikipedia.org/wiki/Horizontal_and_vertical

The usage of the inter-related terms horizontal and vertical varies with context. There are ... When the curvature of the earth is taken into account, the concepts of vertical and horizontal take on...

Horizontal | Definition of Horizontal by Merriam-Webster

www.merriam-webster.com/dictionary/horizontal

Define horizontal: positioned from side to side rather than up and down : parallel to the ground — horizontal in a sentence.

Definition of Horizontal - Math is Fun

www.mathsisfun.com/definitions/horizontal.html

Horizontal. Horizontal. Going side-to-side, like the horizon. Parallel to the horizon . (Up-down is called vertical). See: Vertical ...

Horizontal - definition of horizontal by The Free Dictionary

www.thefreedictionary.com/horizontal

Define horizontal. horizontal synonyms, horizontal pronunciation, horizontal translation, English dictionary definition of horizontal. adj. 1. Of, relating to, or near ...

horizontal - Dictionary Definition : Vocabulary.com

www.vocabulary.com/dictionary/horizontal

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.

Horizontal - math word definition - Math Open Reference

www.mathopenref.com/horizontal.html

Definition of 'horizontal' and comparison to its cousn 'vertical'