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Definition of horizontal:

  1. Measured or contained in a plane of the horizon; as, horizontal distance.
  2. Parallel to the horizon; on a level; as, a horizontalline or surface.
  3. Pertaining to, or near, the horizon.


crosswise, regular, parallel, swimming, smooth, plane, decumbent, naiant, procumbent, prone, prostrate, recumbent, uniform, level, flat, plain, straight.

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