horizontal
US /ˌhɔːr.ɪˈzɑːn.t̬əl/
UK /ˌhɔːr.ɪˈzɑːn.t̬əl/
1.
parallel to the plane of the horizon; at right angles to the vertical
:
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Draw a horizontal line across the page.
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The sun cast long horizontal shadows.
1.
a horizontal line, plane, or position
:
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Adjust the screen to the correct horizontal.
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The architect ensured all beams were perfectly horizontal.