horizontal Meaning, Definition & Usage

  1. noun something that is oriented horizontally
  2. adjective parallel to or in the plane of the horizon or a base line
    • a horizontal surface

WordNet

Hor`i*zon"tal adjective
Etymology
Cf. F. horizontal.
Definitions
  1. Pertaining to, or near, the horizon. "Horizontal misty air." Milton.
  2. Parallel to the horizon; on a level; as, a horizontalline or surface.
  3. Measured or contained in a plane of the horizon; as, horizontal distance.

Webster 1913