horizontal

of or relating to the apparent junction of earth and sky : situated near the horizon

parallel to, in the plane of, or operating in a plane parallel to the horizon or to a baseline : level

relating to, directed toward, or consisting of individuals or entities of similar status or on the same level

a steel bar supported in a horizontal position approximately eight feet above the floor and used for swinging feats in gymnastics

an event in gymnastics competition in which the horizontal bar is used