ˌhɔrɪˈzɔntl adj. & n. --adj. 1 a
parallel to
the plane of the
horizon, at
right angles to the
vertical (horizontal plane). b (of
machinery etc.) having
its parts
working in a horizontal
direction. 2 a combining firms
engaged in the
same stage of
production (horizontal integration). b involving
social groups of
equal status etc. 3 of or at the horizon. --n. a horizontal line, plane, etc. øøhorizontality n. horizontally adv. horizontalness n. [F horizontal or mod.L horizontalis (as HORIZON)]