horizontal
adjective
[ hɒrɪˈzɒnt(ə)l ]
• parallel to the plane of the horizon; at right angles to the vertical.
• "a horizontal line"
• being at or involving the same level of a hierarchy.
• "horizontal class loyalties"
• of or at the horizon.
• "the horizontal moon"
horizontal
noun
• a horizontal line, plane, etc.
Origin:
mid 16th century (in horizontal (sense 3 of the adjective)): from French, or from modern Latin horizontalis, from late Latin horizon, horizont- (see horizon).
