Definition of "horizontal" []

• Of, relating to, or near the horizon. (adjective)
• Parallel to or in the plane of the horizon. (adjective)
• At right angles to a vertical line. (adjective)
• Occupying or restricted to the same level in a hierarchy: a horizontal study of verbal ability; a horizontal transfer by an employee. (adjective)
• Something, such as a line, plane, or object, that is horizontal. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The machine had no vertical rudder, but they fitted it, in front, with what they called a horizontal rudder, that is, an elevator."
• "He works in an analogous universe, building what he calls the "horizontal of power," a jab at Putin's "vertical of power.""
• "I think seeing how much breadth someone's had, and their appetite for not just vertical career ladders, but their appetite for what I call the horizontal experiences, where it wasn't always just about a title or the next layer up."