[hor.i.zon.tal] adj (1555) 1 a: of, relating to, or situated near the horizon b: parallel to, in the plane of, or operating in a plane parallel to the horizon or to a base line: level "~ distance" "~ engine"
2: relating to, directed toward, or consisting of individuals or entities of similar status or on the same level "~ mergers" "~ hostility" -- horizontal n -- hor.i.zon.tal.i.ty n -- hor.i.zon.tal.ly adv